Disconnect the power brick, keyboard cover, and all external USB devices.
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Microsoft maintains a secret hardware debug port on the Surface Pro 4 motherboard (JST 4-pin connector near the SSD). This port speaks JTAG/SWD. surface pro 4 bios password reset high quality
Some third-party tools claim to reset the BIOS password on Surface devices. However, we do not recommend using these tools, as they may: Disconnect the power brick, keyboard cover, and all
Why this works: Some legacy PS/2 emulation in the Surface BIOS has a buffer overflow that skips the password check on specific firmware versions (v3.11.xxx and older). Disconnect the power brick
Open a support ticket specifically for a "UEFI/BIOS Password Reset."
This method involves shorting the SPI flash chip to temporarily corrupt the read process, forcing the UEFI to default to factory settings.