BitLocker PIN/recovery is not working

B

BLaszloX

I have a serious issue and I hope someone can help me out to recover my data. Unfortunately my BitLocker has locked me out of my own PC, although I have both the BitLocker PIN and the recovery code (however, the ID mismatches).

Some background information:
1. I have Windows 10 (64bit) operating system with C (system) and D (data) partitions
2. Yesterday I was performing some operations:
- Extended/shrinked/added hard disk partitions
- Observed that my C drive was not encrypted with BitLocker so I clicked on "Bitlocker > Resume protection". This appeared to be working without asking me for any PINs or passwords.
- Cleaned up my system files with the windows Disk cleanup tool because my C drive was almost full.
- Had to reboot the machine and it started to install a Windows system update (it took a while)
- I also observed it did a BIOS firmware update (actual BIOS version 1.13.0)


After the restart, the system was asking me for my BitLocker PIN what I entered. It prompted me, that I should also enter the recovery key for BitLocker due to some recent changes on the drives. Unfortunately the key ID what I was prompted did NOT match with the recovery key ID what I had in my records, therefore the recovery code what I entered was not accepted. I am certain that I wrote the correct recovery string and I am sure it was generated for this PC/system.



What could I do to recover my data? I am mainly interested in the data located on partition D.

The potential solutions what I currently think of:
- Is it possible that the recovery key what I have is only valid for drive D? If yes, how could I access it? (right now I am unable to boot up Windows normally)
- Could I format and reinstall windows on drive C without affecting partition D?
- Would it help if I buy an external SDD rack and try to access drive D through a different PC? Would the BitLocker PIN be sufficient in that case to decrypt the drive?
- Would a system restore be somehow possible? Right now I am unable to start Windows.
- Any other suggestion is highly appreciated.


Thank you.

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