And, yes, I
think you can use your old backed-up library.
Although, of course I don't know exactly what state it is in.
But yes, I would say:
Step 1. Restore your old library.
Step 2. Read this thread:
https://www.mobileread.com/forums/sho...2&postcount=37
Step 3: Follow exactly and in the order presented, the advice here:
https://www.mobileread.com/forums/sho...4&postcount=38