Warning! The username or password was wrong!

[mnemorex]

Hello,
after more than 20 days trying to install Part-DB on a raspberry, yesterday, by a miracle I managed to do it by reading hundreds of pages on the various problems encountered, but at the first connection, a window asked me to put updated the DATABASE from 0 to 26. this is what I did, but now no longer possible to connect, all USER and PASSWORD, no longer work.
I tried to reset the passwords with the file: reset_admin_pw.php and I have a DENIED ACCESS.
I don't know where to look, could you help me please.
Thank you.