You can downgrade to any version as long as "BIOS RollBack Prevention" is disabled in Security settings. Warning: Downgrading may cause Windows to crash if the new UEFI drivers are removed. Only downgrade if you are experiencing a verified regression.
(If you want, I can: 1) check the latest BIOS version and release notes for your exact serial/model now — provide your model/serial or let me know to look up general public release notes; or 2) produce a step‑by‑step update script for enterprise deployment.)
Whether you are a professional trying to squeeze out every ounce of performance, an IT administrator managing a fleet of devices, or a user trying to fix a boot failure, understanding the BIOS is non-negotiable. This article will walk you through every critical aspect of the P1 Gen 4’s firmware—from accessing it and navigating its hidden menus to updating it safely and solving common configuration errors.
When the logo screen is displayed, press F1 or Fn+F1 to enter the BIOS menu.
However, even the most powerful hardware is useless without a well-tuned foundation. That foundation is the (Basic Input/Output System)—officially referred to by Lenovo as the UEFI firmware .