Lenovo ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual
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Lenovo ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual

Lenovo ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual

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ThinkPad X12 Detachable Gen 2
Hardware Maintenance Manual

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  • Page 1 ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual...
  • Page 2 First Edition (April 2024) © Copyright Lenovo 2024. LIMITED AND RESTRICTED RIGHTS NOTICE: If data or software is delivered pursuant to a General Services Administration “GSA” contract, use, reproduction, or disclosure is subject to restrictions set forth in Contract No. GS-...

  • Page 3: Table Of Contents

    Reset or restore Windows ... General guidelines....Use Lenovo recovery options..Before servicing the computer ..
  • Page 4 I/O bracket....NFC module, NFC module cable, and NFC Appendix B. Abbreviation table ..87 antenna (for selected models) ..ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual...

  • Page 5: About This Manual

    About this manual This manual contains service and reference information for the following product: Product name Machine type (MT) ThinkPad X12 Detachable Gen 2 21LK and 21LL Use this manual along with the advanced diagnostic tests to troubleshoot problems. Important: •...
  • Page 6 ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual...

  • Page 7: Chapter 1. Safety Information

    • Fan louvers on the machine help to prevent overheating of internal components. Do not obstruct fan louvers or cover them with labels or stickers. Electrical safety Observe the following rules when working on electrical equipment. © Copyright Lenovo 2024...
  • Page 8 This practice ensures correct grounding of the units. • If an electrical accident occurs: – Use caution; do not become a victim yourself. – Switch off power. – Send another person to get medical aid. ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual...

  • Page 9: Safety Inspection Guide

    4. Check for cracked or bulging batteries. 5. Remove the cover. 6. Check for any obvious non-ThinkPad / non-Lenovo alterations. Use good judgment as to the safety of any non-ThinkPad / non-Lenovo alterations. 7. Check inside the unit for any obvious unsafe conditions, such as metal filings, contamination, water or other liquids, or signs of fire or smoke damage.

  • Page 10: Grounding Requirements

    The safety notices in this section are provided in the following languages: • English • Arabic • Brazilian Portuguese • French • German • Hebrew • Japanese • Korean • Spanish • Traditional Chinese DANGER DANGER ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual...
  • Page 11 DANGER DANGER DANGER DANGER DANGER DANGER Chapter 1 Safety information...
  • Page 12 ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual...
  • Page 13 PERIGO PERIGO PERIGO Chapter 1 Safety information...
  • Page 14 PERIGO PERIGO PERIGO PERIGO PERIGO DANGER DANGER ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual...
  • Page 15 DANGER DANGER DANGER DANGER DANGER Chapter 1 Safety information...
  • Page 16 DANGER VORSICHT VORSICHT VORSICHT VORSICHT ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual...
  • Page 17 VORSICHT VORSICHT VORSICHT VORSICHT Chapter 1 Safety information...
  • Page 18 ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual...
  • Page 19 Chapter 1 Safety information...
  • Page 20 ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual...
  • Page 21 Chapter 1 Safety information...
  • Page 22 ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual...
  • Page 23 Chapter 1 Safety information...
  • Page 24 ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual...

  • Page 25: Chapter 2. Important Service Information

    – “FRU identification” on page 20 Important: • Advise customers to contact the Lenovo Customer Support Center if they need any assistance in obtaining or installing any software fixes, drivers, and UEFI BIOS downloads. Telephone numbers for Lenovo Support are available at: https://pcsupport.lenovo.com/supportphonelist...

  • Page 26: How To Use Error Message

    Dynamic Configure To Order (CTO) model This model provides the ability for a customer to configure a Lenovo solution from a Web Site, and have this configuration sent to fulfillment, where it is built and shipped directly to the customer. The machine label and eSupport will load these products as the 4-character MT, 4-character model, and 2-character country code.

  • Page 27: Chapter 3. General Checkout

    Before checking problems with the computer, determine whether the damage is covered under the warranty by referring to the following list: © Copyright Lenovo 2024...

  • Page 28: Checkout Guide

    Note: If you are unable to isolate and repair the problem yourself after running the program, save and print the log files created by the program. You need the log files when you speak to a Lenovo technical support representative.

  • Page 29: Quick Test Programs

    • Mouse • PCI Express • Touch Bootable diagnostic programs If the computer you are servicing is not installed with the UEFI diagnostic program, you can download a bootable diagnostic program from the Lenovo Support Web site. Chapter 3 General checkout...

  • Page 30: Power System Checkout

    Step 4. Insert a straightened paper clip into the emergency-reset hole to reset the computer. If the computer is still powered on, it means that the ac power adapter is functional. ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual...

  • Page 31: Checking The Ac Power Adapter

    Checking the built-in battery and operational charging This system supports only batteries specially designed for this specific system and manufactured by Lenovo or an authorized manufacturer. The system does not support unauthorized batteries or batteries designed for other systems.
  • Page 32 ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual...

  • Page 33: Chapter 4. Related Service Information

    When the latest maintenance diskette and the system program service diskette become available, they will be posted on: https://support.lenovo.com Reset or restore Windows To reset or restore Windows, refer to the information below： Use Lenovo recovery options Step 1. Go to https://support.lenovo.com/HowToCreateLenovoRecovery Step 2.

  • Page 34: Power-On Password

    The system management password can also protect the system information stored in UEFI BIOS like a supervisor password, but it has lower authority by default. The system management password can be set through the UEFI BIOS menu or through Windows Management Instrumentation (WMI) with the Lenovo client-management interface.

  • Page 35: How To Remove The Power-On Password

    Lenovo cannot reset your passwords or recover data from the storage drive. You can contact a Lenovo authorized service provider to have the storage drive replaced. A fee will be charged for parts and service. If the storage drive is a CRU (Customer Replaceable Unit), you can also contact Lenovo to purchase...

  • Page 36: How To Remove The System Management Password

    In certain circumstances, the computer goes into sleep mode automatically: • After a period of inactivity specified in power plan settings • When the battery power is low To resume the computer from sleep mode, press the power button. ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual...

  • Page 37: Hibernation Mode

    Also, in either of the following events, the computer automatically returns from sleep mode and resumes operation: • The ring indicator (RI) is signaled by a serial device or a PC Card device. • The time set on the resume timer elapses. Note: The computer does not accept any input immediately after it enters sleep mode.

  • Page 38: Numeric Error Codes

    3. Replace the system board. 2110 1. Reseat the M.2 solid-state drive. Read error on Main HDD (SSD0) or Read error on Main 2. Replace the M.2 solid-state drive. HDD (HDD0) 3. Replace the system board. ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual...

  • Page 39: Error Messages

    The battery installed is not supported by this system and Replace the battery. will not charge. Please replace the battery with the correct Lenovo battery for this system. Press the Esc key to continue. This system does not support batteries that are not Replace the battery.
  • Page 40 • We recommend that you speak to our Customer Support Center before attempting to service the computer yourself so that you can be directed to the correct documentation and repair information. It might be recommended to have a Lenovo-authorized service provider repair your computer depending on the complexity of the error or fault.

  • Page 41: Beep Symptoms

    Blinking patterns Error codes Solutions 0287: Discrete graphics error 1. Reinstall or replace the discrete graphics card (service provider only). 2. If step 1 does not work, replace the system board (service provider only). 0288: Computer display error 1. Reconnect the display cable on both the system board side and the computer display side (service provider only) and check the LCD panel.

  • Page 42: Lcd-Related Symptoms

    If the LCD you are servicing has two or less visible defective pixels, it should not be considered faulty. However, if the LCD has three or more visible defective pixels, it will be deemed as defective by Lenovo and it should be replaced.

  • Page 43: Intermittent Problems

    Symptom or error FRU or action, in sequence No beep, power-on indicator on, and a blank LCD during 1. Run LCD Self Test. POST. 2. Replace the system board. • LCD backlight not working. 1. Reseat the LCD connectors. • LCD too dark. 2.
  • Page 44 If the problem does not recur, reconnect the removed devices one at a time until you find the failing FRU. Step 7. If the problem remains, replace the following FRUs one at a time (do not replace a nondefective FRU): System board LCD assembly ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual...

  • Page 45: Chapter 5. Use The Keyboard Shortcuts

    • Launch Copilot in Windows. • Launch Windows Search. Note: The function varies by countries or regions. Open the context menu of the current active app. Fn + Adjust the keyboard backlight. Fn + Go to beginning. Fn + © Copyright Lenovo 2024...
  • Page 46 Fn + 4 Enter sleep mode. Fn + B Break operation. Fn + K Scroll contents. Fn + P Pause operation. Fn + S Send system request. For more keyboard shortcuts, go to https://support.lenovo.com/us/en/solutions/windows-support ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual...

  • Page 47: Chapter 6. Locations

    NFC (near field communication) mark* Speaker Touch screen Volume up / down button Security—lock slot ® USB-C power connector (USB SIM-card tray* 10Gbps) USB-C connector (Thunderbolt™ 4) Audio connector * for selected models Webcam privacy shutter © Copyright Lenovo 2024...
  • Page 48 2. Insert a straightened paper clip into the hole to cut off power supply temporarily. 3. Connect your computer to ac power and then turn on your computer. Note: If your computer is still no response, you can call Lenovo Customer Support Center to get further help.
  • Page 49 CAUTION: When the computer is operating, it should be placed on a hard and flat surface with its bottom area not in contact with user’s bare skin. Under normal operating conditions, the temperature of the bottom surface will remain within an acceptable range as defined in IEC 62368-1, but such temperatures can still be high enough to cause discomfort or harm to the user if directly touched for over one minute at a time.

  • Page 50: Locating Frus And Crus

    Lenovo will ship the CRU to you. CRU information and replacement instructions are shipped with your product and are available from Lenovo at any time upon request. You can find a list of CRUs for your product in this Hardware Maintenance Manual. An electronic version of this manual can be found at https://support.lenovo.com...

  • Page 51: Major Frus And Crus

    Major FRUs and CRUs Chapter 6 Locations...
  • Page 52 Lenovo Digital Pen* Lenovo Precision Pen* Kickstand Built-in battery Removable tape Pogo pin cable USB-C board cable USB-C board USB-C board bracket Speakers System board I/O bracket Wireless-WAN card* LCD cable Nano-SIM-card tray ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual...

  • Page 53: Miscellaneous Parts

    • Spec Connector and cable guide This topic provides information to help Lenovo authorized service technicians identify connectors and cables for replacement purpose. To view each FRU and the exploded illustration of the computer, see “Major FRUs and CRUs” on page 45.
  • Page 54 The pogo pin comes with the cable. Connect the cable to this connector. Volume board connector (internal) Volume board cable The volume board comes with the cable. Connect the cable to this connector. ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual...

  • Page 55: Looking Up Fru Information

    Audio connector (external) Connect headphones or a headset with a 3.5-mm (0.14-inch) and 4- pole plug to this connector. Looking up FRU information For detailed FRU information, including part numbers, descriptions, and substitution part numbers, go to: https://support.lenovo.com/partslookup Chapter 6 Locations...
  • Page 56 ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual...

  • Page 57: Chapter 7. Fru Replacement Notices

    • Keep the screw kit in your tool bag. For the part number of the screw kit, go to: https://support.lenovo.com/partslookup Tighten screws as follows: • Plastic to plastic Turn an additional angle of 90 degrees after the screw head touches the surface of the plastic part. © Copyright Lenovo 2024...

  • Page 58: Retaining Serial Numbers

    Go to and follow the instructions on the screen to https://www.lenovo.com/maintenanceutilities create a Maintenance Key. Note: Only an authorized Lenovo service technician can access the above Web site. Step 3. Restart the computer. ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual...

  • Page 59: Retaining The Uuid

    Go to and follow the instructions on the screen to https://www.lenovo.com/maintenanceutilities create a Maintenance Key. Note: Only an authorized Lenovo service technician can access the above Web site. Step 3. Restart the computer. Step 4. When the logo screen is displayed, press Esc. The ThinkPad Config Information Update Utility interface is displayed.

  • Page 60: Reading Or Writing The Eca Information

    To check what ECAs have been previously applied to the machine, use the ECA Information Read/Write function on the LENOVO ThinkPad Hardware Maintenance Diskette or Maintenance Key. Step 1. Insert the latest version of LENOVO ThinkPad Hardware Maintenance Diskette or Maintenance Key, and then restart the computer. Step 2.

  • Page 61: Chapter 8. Removing Or Replacing A Fru

    Click Power Options, and then click Choose what the power buttons do on the left pane. Step 3. Click Change settings that are currently unavailable at the top. Step 4. If prompted by User Account Control (UAC), click Yes. © Copyright Lenovo 2024...

  • Page 62: Removing The Nano-Sim Card And Nano-Sim-Card Tray

    Note: If the computer you are servicing has a nano-SIM card installed, remove the card with the tray together. LCD module Follow the instructions to replace the LCD module. Step 1. Remove the LCD module as shown below. Pivot the kickstand upward. ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual...
  • Page 63 Loosen the screws and then pivot the kickstand downward. Pry up the LCD module gently with a tool and then turn over the LCD module. Chapter 8 Removing or replacing a FRU...
  • Page 64 Note: A mylar film or the tape might cover the cable and the connector. To access the cable and the connector, peel off the film or the tape first. Step Screw (quantity) Color Torque Black 0.181 Nm M2 × L3.5 mm, flat-head, nylon-coated (6) (1.85 kgf-cm) ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual...
  • Page 65 Step 2. Install the LCD module in reverse order. When installing, ensure that the connectors are attached firmly. Attention: When you route the cables, ensure that they are not subject to any tension. Tension could cause the cables to be damaged by the cable guides, or a wire to be broken. Label locations on the back cover assembly The following illustration shows the location of each label.

  • Page 66: Built-In Battery

    Built-in battery Follow the instructions to replace the built-in battery. DANGER Use only the Lenovo authorized battery specified for the computer. Any other battery could ignite or explode. Important notice for replacing a battery Attention: Lenovo has no responsibility for the performance or safety of unauthorized batteries, and provides no warranties for failures or damage arising out of their use.

  • Page 67: Kickstand

    Note: The tapes for securing the built-in battery are not reusable. Whenever the built-in battery is removed, you should order new tapes. Disconnect the connector and then remove the built-in battery. Step 2. Install the built-in battery in reverse order. When installing: •...
  • Page 68 Step 1. Remove the kickstand as shown below. Pivot the kickstand upward. Peel off the cosmetic mylar. Loosen the screws and then remove the kickstand. ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual...

  • Page 69: Hinges

    Torque Step Screw (quantity) Color M2 × L2.5 mm, flat-head, nylon-coated (6) Black 0.181 Nm (1.85 kgf-cm) Step 2. Install the kickstand in reverse order. Hinges Follow the instructions to replace the hinges. For access, remove this FRU in order: •...
  • Page 70 Remove the kickstand and hinges from the back cover assembly. Peel off the cosmetic mylar from the hinges. Loosen the screws of hinges from the kickstand and then remove the hinges. ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual...

  • Page 71: Lcd Cable

    Step Screw (quantity) Color Torque Black 0.181 Nm M2 × L2.5 mm, flat-head, nylon-coated (6) (1.85 kgf-cm) M2 × L2.5 mm, flat-head, nylon-coated (6) Black 0.181 Nm (1.85 kgf-cm) Step 2. Install the hinges in reverse order. LCD cable Follow the instructions to replace the LCD cable. For access, remove these FRUs in order: •...

  • Page 72: Pogo Pin Cable

    • “Built-in battery” on page 60 Step 1. Remove the Pogo pin cable as shown below. Peel off the pogo pin cosmetic mylar. Loosen the screws. Disconnect the connector and then remove the pogo pin cable. ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual...

  • Page 73: Volume Board And Cable

    Step Screw (quantity) Color Torque M1.6 × L2.4 mm, flat-head, nylon-coated (4) Silver 0.098 Nm (1.05 kgf-cm) Step 2. Install the Pogo pin cable in reverse order. Volume board and cable Follow the instructions to replace the volume board and cable. For access, remove these FRUs in order: •...

  • Page 74: Hook Holder For Bezel

    For access, remove these FRUs in order: • “LCD module” on page 56 • “Built-in battery” on page 60 • “Volume board and cable” on page 67 Step 1. Remove the hook holder for bezel as shown below. ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual...

  • Page 75: Security-Lock Bracket

    Step 2. Install the hook holder for bezel in reverse order. Security-lock bracket Follow the instructions to replace the security-lock bracket. For access, remove this FRU: • “LCD module” on page 56 Step 1. Loosen the screws and then remove the security-lock bracket. Step Screw (quantity) Color...

  • Page 76: Usb-C Board And Cable

    • “USB-C board bracket” on page 69 Step 1. Remove the USB-C board and cable as shown below. Disconnect the connector. Loosen the screw and then remove the USB-C board and cable. ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual...

  • Page 77: Thermal Fan Assembly

    Disconnect the USB-C board cable from the board. Step Screw (quantity) Color Torque M2 × L2.5 mm, flat-head, nylon-coated (1) Black 0.181 Nm (1.85 kgf-cm) Step 2. Install the USB-C board and cable in reverse order. Thermal fan assembly Follow the instructions to replace thermal fan assembly. For access, remove this FRU: •...
  • Page 78 Apply new thermal grease at an amount of 0.2 grams, on the part marked as shown in the following illustrations. Either too much or too less application of grease can cause a thermal problem due to imperfect contact with a component. ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual...

  • Page 79: M.2 Solid-State Drive

    M.2 solid-state drive Follow the instructions to replace the M.2 solid-state drive. Before you start, read Generic Safety and Compliance Notices and print the following instructions. Attention: The M.2 solid-state drive is sensitive. Inappropriate handling might cause damage and permanent loss of data. When handling the M.2 solid-state drive, observe the following guidelines: •...

  • Page 80: Speaker Assembly

    Follow the instructions to replace the speaker assembly. For access, remove these FRUs in order: • “LCD module” on page 56 • “Thermal fan assembly” on page 71 Step 1. Disconnect the connector and then remove the speaker assembly. ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual...

  • Page 81: Wireless Wan Card (For Selected Models)

    The following information is only for the computer with user-installable modules. Ensure that you use only a Lenovo-authorized wireless module specifically tested for this computer model. Otherwise, the computer will generate an error-code beep sequence when you turn on the computer.

  • Page 82: Power Board And Cable

    • “Thermal fan assembly” on page 71 Step 1. Remove the power board and cable as shown below. Release P sensor cable. Disconnect the connector. Loosen the screw and then remove the power board and cable. ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual...
  • Page 83 Remove the power board from the cable. Torque Step Screw (quantity) Color M2 × L2.5 mm, flat-head, nylon-coated (1) Black 0.181 Nm (1.85 kgf-cm) Step 2. Install the power board and cable in reverse order. Note: If the P sensor cable loses its stickiness, apply an acetate tape to it. Chapter 8 Removing or replacing a FRU...

  • Page 84: I/O Bracket

    For access, remove this FRU: • “LCD module” on page 56 Step 1. Remove the NFC module, NFC module cable, and NFC antenna as shown below. Disconnect the connector and then remove the NFC module cable. ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual...

  • Page 85: Webcam Privacy Shutter

    Remove the NFC module and NFC antenna. Disconnect the NFC antenna from the NFC module. Step 2. Install the NFC module, NFC module cable, and NFC antenna in reverse order. Webcam privacy shutter Follow the instructions to replace the webcam privacy shutter. Chapter 8 Removing or replacing a FRU...

  • Page 86: Front Camera Module

    Step 1. Disconnect the connector and then remove the front camera module. Step 2. Install the front camera module in reverse order. Rear camera Follow the instructions to replace the rear camera. ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual...

  • Page 87: Microphone Assembly

    For access, remove these FRUs in order: • “LCD module” on page 56 • “Thermal fan assembly” on page 71 • “Webcam privacy shutter” on page 79 Step 1. Disconnect the connector and then remove the rear camera. Step 2. Install the rear camera in reverse order.

  • Page 88: Front Camera Bracket

    • “Microphone assembly” on page 81 Step 1. Remove the front camera bracket as shown below. Step 2. Install the front camera bracket in reverse order. System board Follow the instructions to replace the system board. ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual...

  • Page 89: Replace The System Board

    Note: After replacing the system board, use the Maintenance Utility to bind the model type, serial number, and Brand ID of the computer with the new system board. Refer to https://support.lenovo.com/us/en/ solutions/HT506954 for instructions on how to do that. As an alternative, you also can use the Golden Key U1 tool for that purpose.
  • Page 90 Loosen the screw and then remove the system board. Step Screw (quantity) Color Torque M2 × L2 mm, big-head, nylon-coated (1) Black 0.181 Nm (1.85 kgf-cm) Step 2. Install the system board in reverse order. ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual...

  • Page 91: Appendix A. Notices

    Lenovo representative for information on the products and services currently available in your area. Any reference to a Lenovo product, program, or service is not intended to state or imply that only that Lenovo product, program, or service may be used. Any functionally equivalent product, program, or service that does not infringe any Lenovo intellectual property right may be used instead.
  • Page 92 Trademarks Lenovo, Lenovo logo, ThinkPad, ThinkPad logo, and TrackPoint are trademarks of Lenovo. Intel and Thunderbolt are trademarks of Intel Corporation or its subsidiaries in the U.S. and/or other countries. ® Microsoft, Microsoft Teams, and Windowsare trademarks of the Microsoft group of companies. USB4 ®...

  • Page 93: Appendix B. Abbreviation Table

    Electrically Erasable Programmable Read-Only Memory Extensible Firmware Interface Electrostatic discharge Field Replaceable Unit General Announce Variant Integrated circuits Liquid Crystal Display Machine type and model POST Power-on self-test RFID Radio-frequency identification Supervisor password UUID Universally unique identifier © Copyright Lenovo 2024...
  • Page 94 ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual...
  • Page 96 Part Number: SP41L93340 Printed in China (1P) P/N: SP41L93340 *1PSP41L93340*...

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