So to do this, you can use phpMyAdmin on your server. It’s usually in Cpanel root under SQL Services, or in your Cpanel user account under same section.
You can execute SQL queries that in effect delete the Admin user, and then re-add it with a specific password.
This password is encrypted so that’s why it looks the way it does.
351683ea4e19efe34874b501fdbf9792:9b is actually the password ‘admin’.
Once you do the below changes you should be able to login using:
Username: Admin
Password: admin
EXECUTE PHPMYADMIN SQL QUERIES:
Here’s what you can do in Zen Cart 1.5.1x.
DELETE FROM admin WHERE admin_name = 'Admin'; INSERT INTO admin (admin_name, admin_email, admin_pass, admin_profile) VALUES ('Admin', 'admin@localhost', '351683ea4e19efe34874b501fdbf9792:9b', 1);
For Zen Cart v1.3.9 and older, do this QUERY:
DELETE FROM admin WHERE admin_name = 'Admin'; INSERT INTO admin (admin_name, admin_email, admin_pass, admin_level)
RESET TEMP PASSWORD AFTER REGAINING ACCESS:
Once you are back in, go into your Administrator tab and reset the password and save it someplace you can get it later like a Google Document.
Here’s more info straight from Zen Cart FAQ:

