Might be possible that testdisk hang due to a faulty file system?
If rebuildBS doesn't work, you´ll need probably datarecovery software.
You can have a look to photorec.
I suggest to recover files first.
Afterwards you can have a try to repair your file system running chkdsk Driveletter: /r
Running chkdsk without file recovery in advance would be on your own risk.
CrystalDiskInfo displays your disk with caution.
It means that you should backup/recover your data right now.
How to use TestDisk to recover lost partition
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