The startup method of USB flash drive in the bios setup of Lenovo computer is as follows: \x0d\ 1. Turn on Lenovo notebook computer, press F2 to enter the bios setting interface when the boot screen appears, use the left and right arrow keys to move the cursor to the safe menu, then use the up and down arrow keys to move the cursor to the safe boot, and press Enter to execute; \x0d\2。 Then use the up and down arrow keys to move the cursor to the safe boot option and press Enter to execute. In the small window that pops up, use the up and down arrow keys to move the cursor to the disabled option and press enter to confirm the selection; \x0d\3。 Then press the esc key to return to the main interface of bios setup, use the left and right arrow keys to move the cursor to the startup menu, use the up and down arrow keys to move the cursor to UEFI/Legacy Boot option, and press enter to execute; \x0d\4。 In the small window that pops up, use the up and down arrow keys to move the cursor to the legacy only option and press Enter to execute. After completing the above operations, press F 10 to pop up the query window, and click Yes to save and exit. \x0d\5。 After restarting the computer, when the startup screen appears, press F 12 to enter the startup window. At this time, you can see the option to start the USB flash drive. Move the cursor to the USB flash drive startup item and press enter (you need to insert a bootable USB flash drive first).