How to replace Lenovo N40-80win8 system with gost win7 system? How to change the boot?

Step 1: Press F2 to enter the BIOS；;

Step 2: under the boot menu of BIOS, change the secure boot to disabled; ;

Step 3: change the boot list option to Legacy and restart;

Step 4: Press F2 to enter the BIOS interface again, select the "Advanced BIOS Features" setting item, and press Enter to enter;

Step 5: Select the first item (boot from USB flash drive) or the third item (boot from DVD);

Step 6: Press F 10, then select "Y", click "Enter" to complete the setup and restart the computer.