Upgrade from 1.2 to 1.4 issues

Hi there,

I'm upgrading the a existing forum from 1.2 to 1.4 and I'm running into some issues,

1) The Admin account have wrong password, and I can't reset... I read about MD5 converter, but seems 1.4 might use something else. Anyways I'm still investigating on this one, but would be cool if you guys have already an idea..

2) My forum has both english and portuguese topics, so when I run db_update.php basically cuts the whole text in a post after a special character is found like ã, or é..
Initially I though it was when duplicating the DB, but it's not because if I duplicate DB and connect the old forum to the new DB it works fine.

3) The Users table also gets reduced to half. I'm guessing some

Thanks a lot for any help!

Cheers,
Andre