Problem with T46G

Hi, I have a T46G telephone, until now, it works perfectly. But yesterday, tha screen was black, and when I try to web access, I can't, the user/pass incorrect.

I upgrade the firmware to the last, and tha screen it is fixed, but I can't web access, user/pass incorrect.

I've tried to change pass over provisioning, the pass is changing successful in the other phones, but in the T46G, user/pass incorrect...

After upgrade the phone, I loose the key configuration.

The phone is far from me, how can I change the password or what can I do??

Thanks