If you only need to reset your (not the BIOS/UEFI), you can factory reset the device without knowing the current login credentials:
If you have access to a (MS Part #X885495-001), you can attach it to this port and send the command: fpt -erasebiospassword fpt -clrbiospassword
To help you make an informed decision, here is a comparison of all possible methods:
If you cannot access Windows and are completely locked out, a deep capacitor drain can sometimes force the non-volatile memory to clear its temporary registers. While this does not wipe the encrypted chip directly, it can resolve glitches where the UEFI misreads a correct password. Shut down the Surface Pro 4 completely.
Method 1: The Official Microsoft Recovery Image (Non-Destructive Free Try)
Method 3: Hardware EEPROM Reprogramming (The Definitive Solution)
⭐⭐⭐⭐ (4/5) – Effective, but not beginner-friendly. Worth it for a locked, otherwise functional Surface Pro 4.
This method requires advanced soldering skills and, if done incorrectly, will permanently destroy your Surface Pro 4 .
This will not work if the BIOS itself is password-protected from the start, but it can resolve some secondary security lockouts. 4. Advanced: Manual CMOS and BIOS Reflashing
Keep TPM enabled to guarantee Windows 10/11 security features work smoothly without needing manual UEFI adjustments.