Dolphin 7 admin username password has been an elusive beast since the release with the Salt implementation on Dolphin 7. I am glad to see there is a query that can be ran that will square this away.
provided by Deano and LeonIds
UPDATE `Profiles` SET `Salt` = CONV(FLOOR(RAND()*99999999999999), 10, 36) WHERE `ID`='1';
UPDATE `Profiles` SET `Password` = SHA1(CONCAT(md5('testtest'), `Salt`)) WHERE `ID`='1';
Also when you change passwords via the database you need to delete the cache file for that member.
Delete user1.php from the cache folder on the server.
*NOTE* if you have Deano's Tools installed, you can run this query from there as well and no need to login to phpmyadmin.