Can't upgrade db: Admin Password Required- but won't accept my password

[mc12345678]

Correct vanilla install, nothing more than a single module, and 2 templates with their modules ...
I hope the password script validation uses Encode base 64 otherwise I need to encode 1 into whatever encoder ZC uses ...

BTW I used PHPmyAdmin for that ...

So are you saying that you had some sort of additional password encrypter using the earlier zC version? If that's the case, then thatshould be incorporated to your upgrade process and new cart. The install is expecting the password to exist as it normally is in ZC. The other option I would think would be to use the default "admin" password for resetting the password.