Cant login with admin

i installed dolphin 7 before 1 week,

and now i cant login with my admin acount.

i try to change the password, but it's still not login.

Possibly try changing the admin md5 password in the database if you can not login with what you originally used.

i try this, not working...

also, i change the id of active user to 1 (for admin, no?) and he's stop to login.

when i rechange him, he's start to login.