Locate your Surface Pro 4 serial number (printed under the kickstand). Visit the official Microsoft Device Support portal. Register the device to your Microsoft account.
If the above methods don't work, you can contact Microsoft Support for assistance. They can provide you with a special tool to reset the BIOS password. surface pro 4 bios password reset high quality
the specific NVRAM variables associated with the supervisor password. Locate your Surface Pro 4 serial number (printed
An SOIC8 chip test clip (to read the chip without unsoldering) or a hot-air rework station. A secondary operational computer. If the above methods don't work, you can
Press and hold the Volume Up button and the Power button at the same time for at least 15 seconds. Do not let go if the Surface logo flashes.
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.