Can no longer log in as admin

Using the latest OpenCart version.

Yesterday I've created a testuser to be able to test putting articles in the cart and how everything is handled. Today I can no longer log in to the admin-section to administer my OpenCart.

What has happened here ?

The table 'customer' counts 1 user...
The table 'user' counts 1 user, namely my admin-login with user_id 1. Status is 1. Password is filled in (encoded) but apparently has changed ?!

You must have changed something as nothing gets deleted "automaticly".

"Something" like what ??

Yesterday added some products and played customer to test the Cart... If creating a customer means I can no longer log in as admin, then my cart is dead before I release it.

I really did not do anything else... I did not edit any code, nor directly the database. Even if I know mysql and php, I just acted like a 'dumb' store admin and customer.

And when looking into the MySQL-DB right now, I see that nothing has changed with the customers or admin credentials...

I am eager to start editing the MySQL-DB to manually create an admin, as there is no other way to change things right now...

Have a look Here.