Unlike older laptops, the Surface Pro 4 does not use a traditional CMOS battery that you can simply unplug. The BIOS password is saved in non-volatile RAM (NVRAM). However, a deep power drain can sometimes glitch the chip into a clear state. Steps to Drain the Power
Before assuming the worst, try these two things:
Before exploring solutions, it's crucial to understand Microsoft's official stance on this issue. The Surface Pro 4 uses a UEFI (Unified Extensible Firmware Interface) password system, which is fundamentally different from a Windows user password. According to official support documentation,
Forgetting a BIOS or UEFI (Unified Extensible Firmware Interface) password on a Microsoft Surface Pro 4 can feel like a disaster. Unlike traditional laptops where removing a CMOS battery is straightforward, the Surface Pro 4 is designed with security in mind, making password recovery difficult. A lost UEFI password restricts access to essential hardware configurations, secure boot settings, and USB booting options. surface pro 4 bios password reset high quality
Apply the Reset: Power on the device while holding the Volume Down button. The UEFI will read the cryptographic certificate on the drive and safely clear or overwrite the administrative password.
This is a bizarre but verified trick for older Surface Pro 4 firmware versions. The BIOS uses a basic keyboard controller. By flooding the buffer, you can crash the password module.
If the BIOS loads, look for security settings to see if you can change or remove the password. 2. Microsoft Official Support (Proven High-Quality) Unlike older laptops, the Surface Pro 4 does
This process is extremely risky; it can break the screen during disassembly or corrupt the touch screen firmware, rendering touch input unusable. 2. Software Workaround (SEMM Method)
Unplug the power charger, Surface Dock, Type Cover, MicroSD cards, and any external USB drives.
Online BIOS password calculators that generate keys based on your serial number do not support Microsoft Surface architecture. Steps to Drain the Power Before assuming the
Test and Reassemble: Temporarily connect the battery and screen to test the device. Boot into the UEFI menu (Hold Volume Up + Power) to verify the password prompt is gone. If successful, re-glue the screen matrix. Method 3: Motherboard Replacement
This package is typically deployed over the network or via a bootable USB drive, which safely clears or resets the UEFI password configuration.
In corporate or educational environments, firmware security is often managed via the Microsoft Surface Enterprise Management Mode (SEMM).
A is your most legitimate option. Microsoft provides official recovery images for Surface devices.
Buy the CH341A programmer and learn to use it. Watch three YouTube tutorials on "Surface Pro 4 SPI flash" before touching the motherboard.