after update form 7.1.1 to 7.2.2 the admin pw does not work anymore

with the update form 7.1.1 to 7.2.2 the admin PW has to be reset:

```
The admin username is: root
The admin password is: __ADMIN_PASS__
```

but this new PW does not work on my site - what I'm missing? 
Thanks for your  support