Anyone tried to move Password Keeper database from 8707 to 8100?

I was able to restore my database but I get message that I have to use my old password first. I'm sure I know my old password (which is in fact my current password) and even tested it again on my old Blackberry. No way to get Password Keeper open...

I also created a new 8707 backup, restored the database again, with no luck.

Alway's get the following message: "A password entry created on 'dd/mm/ccyy' is protected by an old password. Please enter the old password to convert the entry"

any suggestions?