Signature collision broke my HDDs


I own two WD Elements Desktop, one 4TB and another 5TB. When I tried to plug them at the same time they had a signature collision and I’ve read I could fix this by making one “online” while it was offline.
But this screwed them up! They suddenly stopped working, one of them is appearing and unallocated space and another one is asking me to format.
I know my data is safe because I tried a recovering software and I can see all my data safely there, but I want to be able to access my data without having to buy another HDD!
How can I fix them?

Thank you.

Thanks for the reply, but how can I find the “BCD” when loading Hive in the registry editor? Thank you.

Can anyone help me?