How to recover data from Surface Pro that won't turn on
When your Surface Pro goes into BitLocker recovery mode, it could be due to a number of issues. Perhaps the company's password security policy locks users out after a specific number of failed sign in attempts. Or it could be that the PC has encountered an unexpected configuration change, hardware malfunction, or security event.
If you have entered the correct BitLocker recovery key, but Surface BitLocker recovery screen and manage-bde command don't accept it, maybe the Surface Pro's SSD has been corrupted. In that case, you need to recover data from Surface Pro that won't turn on.
If you don't have the correct BitLocker recovery key, there is no way to recover data from Surface Pro that you won't boot, refer to how to unlock BitLocker encrypted drive without password and recovery key?
Tutorial to recover data from Surface Pro that won't turn on:
Step 1: Download M3 Data Recovery WinPE edition to a healthy computer.
Step 2: Initilize your empty USB drive to GPT and then create M3 Data Recovery WinPE bootable media on it due to UEFI boot of Surface Pro.
Step 3: Boot your failed Surface Pro from M3 Data Recovery WinPE bootable media.
Step 4: After starting your Surface Pro from M3 Data Recovery bootable media, choose BitLocker Recovery module.
Step 5: Select the BitLocker encrypted drive and click Next.
If you cannot find your BitLocker encrypted drive, click "Find More Partitions" at the top.
Step 6: Enter the 48-digit BitLocker recovery key and then click OK.
Step 7: M3 Data Recovery is scanning the data from BitLocker encrypted drive.
Step 8: After scanning, the lost files will be listed as below window, select the files you need and click Recover to save them to an external drive.
After data recovery is done, it is time to reset Surface Pro so that you can use it again.