From MySQL console or phpMyAdmin you can do this
update users set user_hash = md5('myPassword') where user_name = 'admin';
Avoid any special characters, use just alphanumerical ones to eliminate one possible cause of problems.
Your installation still seems a bit flaky to me. It’s not normal to have all these problems, so I think there is still some issue breaking SuiteCRM code. Likely ownerships, permissions, or htaccess or SELinux issues - stuff that keeps SuiteCRM from successfully finding the files it needs, or writing to the ones it needs to write.