Microsoft does not have a "backdoor" or master password for your specific device.
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
Use a secure password manager to store the UEFI password.
Heat gun, soldering iron, EEPROM programmer (e.g., CH341A), and a clean BIOS dump file. Step-by-Step Hardware Reset surface pro 4 bios password reset high quality
You will need to provide proof of purchase to Microsoft Support.
If you still have access to the Windows operating system, you can sometimes clear the UEFI password using Microsoft's official firmware management tools. Steps to Reset via Windows
You must be able to get to the Windows login screen. Microsoft does not have a "backdoor" or master
Try these passwords as written (case-sensitive):
A message should appear, sometimes showing a hint or a specific code (e.g., 54321 or a string of numbers/letters). Note down this code precisely.
If you , your only realistic options are: If successful, re-glue the screen matrix
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Store your new UEFI password in a secure, encrypted password manager.