Password can be found in plaintext in [name].dat files.
To try and force unlock everything, open [name]_books.dat in a hexeditor (like HxD), search and replace, "hex-values", replace 4900 with 4901, replace all, save.
I would recommend you do this on a new profile, because it might have some side-effects, like marking empty entries as "new" and erasing your legitimate progress.
It should work, but I haven't checked if there are no entries missing.