Lenovo ThinkPad X1 Carbon Gen 12 CAT4 User Manual page 31

Download and install the latest UEFI BIOS update package by one of the following methods:
• Use the fwupdmgr or software utility to check LVFS for firmware updates.
• Go to https://pcsupport.lenovo.com and select the entry for your computer. Then, follow the on-screen
instructions to download and install the latest UEFI BIOS update package.
Note: During the UEFI BIOS update process, Memory Reference Code (MRC) change might cause memory
retraining. Memory retraining is a process to initialize the memory module and run diagnostic tests for the
memory module in your computer. When memory retraining occurs, the screen might be blank. You might
see the LED indicators on Esc, F1, and F4 blinking sequentially to indicate the progress. Do not press the
power button to interrupt the process. Wait a few minutes until the logo screen is displayed.
To know more about UEFI BIOS, visit Knowledge Base of your computer at .
https://pcsupport.lenovo.com
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Chapter 5 Configure advanced settings