Some of my administrators changed the perms of the admin group and I don't have enough access on acp, how can I give myself unrestricted access editing the database using phpmyadmin?

The simplest solution would be to have the same admin change those permissions back, or put you in the same group they are in. You could change the user group in PMA in the core_members table, but this is not something we would generally recommend. The recommended action would be to revert your database to a point before that action was taken