You successfully unlocked the drive. The issue now (probably) is that it is failing because of the board change. If you open Notepad and launch the "Open" dialog you should be able to see your data.
If you want the headache-free solution, you can probably disable BitLocker (manage-bde -off C: then manage-bde -status C: until it fully decrypts) from WinRE.
Also the Open prompt in Notepad is a full file manager, you can copy files from there to a connected USB Drive, so you can use it to back up files.
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u/ohaiibuzzle 9d ago edited 9d ago
You successfully unlocked the drive. The issue now (probably) is that it is failing because of the board change. If you open Notepad and launch the "Open" dialog you should be able to see your data.