T25: strange behaviour after factory reset

Dear all,
in order to replace a mxdevice, I had to reset my T25 and MX devices.

I have done Autoconfiguration procedure and saved super PIN.

After that I went in T25 with default password. Obviously I had to insert the new admin password twice but without receiving pop up about the success of the operation.

Now I cannot go in T25 web browser neither with default password, neither with new password neither with SUPER PIN.

System completely out of service.

What di you suggest please?