Avast activates Bitlocker and the recovery key is not stored and the TPM does not work after the Bio

[Scudo]

We have an HP Prodesk desktop with Windows 10 Home. Someone has installed Avast antivirus on it, which activates disk encryption. The encryption recovery key has never been saved.

The machine apparently got a Bios update and now Windows won't start anymore, but it's waiting for the Bitlocker recovery key to be entered.

Things tried so far:
1. Turned off Secure boot
2. Restore default tpm keys
3. Turned on Secure boot

Is it possible to use this at all anymore or is there some way to make that disk still work?

[mantis8]

I have a very similar problem:  I have an HP laptop and avast asked a question and said I needed to reboot, so I did and now the entire drive is locked up with bitlocker and we're still trying to figure out if its possible to bypass bitlocker somehow.   I thought we had the BL recovery key backed up, but apparently not. 

The only possibility I've found is to use dislocker on a linux usb stick and copy/decrypt the data from the windows hdd to the usb, then restore the windows hdd back to the factory settings, then add the files back.  If you have set up a restore point before the bitlocker disaster, you might be able to fix the problem.