[BIOS] Lenovo T470 downgrade BIOS firmware

If want to downgrade bios show error message " lenovo disable secure rollback prevention "

solution :

F1 enter BIOS Setup menu > Security > UEFI BIOS Update Option > Secure Rollback Prevention (Disable)


Reference :
Lenovo – BIOS rollback flash failure (Secure Flash Authentication Failed) when “Secure Rollback Prevention” enabled – ThinkPad