The Surface Pro 4 does not use a volatile CMOS battery for firmware security; pulling the battery cable will only reset the system clock, not the password.
is a high-difficulty task because Microsoft does not provide a software-based "backdoor" or reset tool for these security credentials. Microsoft Learn
Are you comfortable using , or do you prefer software-only solutions ? surface pro 4 bios password reset high quality
Reinstalling Windows or wiping your hard drive has absolutely no effect on the underlying motherboard UEFI firmware security. How to Prevent Future UEFI Lockouts
A factory reset will not remove a BIOS password. The Surface Pro 4 does not use a
The following article outlines the only reliable methods for addressing a locked UEFI, ranging from official software resets for manageable issues to advanced hardware modification for total lockouts. Understanding Surface Pro 4 UEFI Security
To clear this password, you must use official administrative recovery channels or hardware-level reprogramming. Reinstalling Windows or wiping your hard drive has
You must contact Microsoft Surface Support and request a "UEFI password reset file."
remove a UEFI/BIOS password if you are trying to change hardware settings. Surface pro 4 UEFI password - Microsoft Q&A
Do Not Short Random Motherboard Pins: Attempting to short random pins on the motherboard while powering the unit on will permanently destroy the CPU or power management integrated circuits (PMICs).
Resetting a forgotten BIOS/UEFI password on a Microsoft Surface Pro 4