Hi @PaulOkello,
I would advise you format your disk using DiskPart -> clean all (https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/clean) which will clean all of the sectors on the disk fully.
Note that the ESET Encryption Boot files are not stored within the BIOS rather the EFI System Partition (ESP), so formatting the Disk completely will remove these files and you will not need to enter your FDE Password again or remove it manually.
You shall then be able to freshly install Windows and start again.
However, we might be able to assist you in decrypting the Disk if we can understand why you were not able to use the Recovery Password, what did it say when you attempted to use the Recovery Password?
Also, have you attempted to use the Recovery Data to decrypt the Disk by any chance: https://help.eset.com/efde/en-US/recovery_data.html using our ESET Recovery Utility?
Thank you,
Kieran
