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Chapter 4. Create and use a USB repair shim
This chapter contains the following topics:
• "What is a USB repair shim?" on page 31
• "Create a USB repair shim" on page 31
• "Use the USB repair shim" on page 31
What is a USB repair shim?
You can create a USB repair shim by writing a repair shim image to a USB storage drive. With the USB repair
shim, you can:
• Refresh the Chromebox system with the latest firmware.
• Diagnose problems and restore the system to factory settings.
Note: Before replacing any FRUs, use the USB repair shim to diagnose and identify problems.
When you use the USB repair shim to diagnose problems, the Chromebox enters the factory-test-image
environment and runs through the following factory test items.
Test item
Required Tests
Optional Test
Google Required Tests
(GRT)
Create a USB repair shim
Step 1.
Prepare a USB storage drive with at least 8 GB of storage capacity.
Attention: The creation process deletes anything stored on the USB storage drive. To avoid data
loss, backup all the data that you want to keep.
Step 2.
Download the image file of the repair shim from
credential is required to download the image file.
Note: Make sure to download the latest version of the image file. A shim created with an earlier
version of the image file might cause the repair process to fail.
Step 3.
Use a disk imaging tool to write the downloaded image to the USB storage drive.
An open-source tool Win32 Disk Imager is available at
win32diskimager
Use the USB repair shim
Step 1.
Plug in the ac power adapter to the device and press the power button.
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Description
The Required Tests is designed to identify the components, verify hardware status.
The Optional test is designed to test the function of individual component, such as the
display, Ethernet, and keyboard.
Some test items might require an HDMI
tests can be bypassed. As a result, the overall test is marked as failed.
The GRT is designed to check the system status and help reset the system back to
factory settings. If any test fails, the GRT has to be forced to end.
.
™
monitor. If the devices are not available, the
https://support.lenovo.com
http://sourceforge.net/projects/
. A Lenovo service
31
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