In order to reset the admin password to "admin" you need to manually edit the database on the device.
Important! The path may be /srv/www/htdocs/db/, or /usr/local/snapt/program/db
cd /srv/www/htdocs/db/ sqlite3 snapt.db
Once inside run .explain --
Then run the following to have a look --
select * from users;
The password is hashed but it will show you the username. Most importantly you want the id of your admin user (normally 1)
You can run this --
update users set password='d033e22ae348aeb5660fc2140aec35850c4da997' where id=1;
To revert the password to admin. Make sure you are root (su - with password snapt) beforehand.