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Note: If the Intel AMT control and Absolute Persistence(R) Module are permanently disabled, these
settings cannot be reset successfully.
6. Enter the supervisor password, system management password or power-on password in the window
prompted.
Your computer will restart immediately. It takes a few minutes to complete the initialization process. Your
computer screen might be blank during this process. This is normal and you should not interrupt it.
Recover the UEFI BIOS
If the UEFI BIOS is corrupted or maliciously attacked, it can self-recover and restore your computer from the
last uncorrupted and secure backup. This function protects your computer data.
During the UEFI BIOS self-recovery, the screen might be blank. You can check the progress based on
blinking modes of the LED indicators on Esc, F1, and F4. For details, refer to the following table.
Note: Do not press the power button to interrupt the progress. Wait a few minutes until the logo screen is
displayed.
Blinking modes
LED indicator on Esc blinks
LED indicator on F1 blinks
LED indicator on F4 blinks
LED indicators on Esc, F1 and F4 blink simultaneously
Update UEFI BIOS
When you install a new program, device driver, or hardware component, you might need to update UEFI
BIOS.
Download and install the latest UEFI BIOS update package by one of the following methods:
• Open the Vantage app to check the available update packages. If the latest UEFI BIOS update package is
available, follow the on-screen instructions to download and install the package.
• Go to
https://pcsupport.lenovo.com
instructions to download and install the latest UEFI BIOS update package.
Note: During the UEFI BIOS update process, 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
Install a Windows operating system and drivers
This section provides instructions on installing a Windows operating system and device drivers.
38
L14 Gen 4 and L15 Gen 4 User Guide
Self-recovery progress
0% to 30%
30% to 45%
45% to 75%
75% to 100%
and select the entry for your computer. Then, follow the on-screen
https://pcsupport.lenovo.com
.
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