Telstra Smart Modem Gen 2 - dodgy update

We have the Gen 2 version that GSM internet AND voice backup and ET complained this afternoon that she tried to make some calls - and nothing ??? OK...ring your mobile - nothing. Ring my mobile - nothing. Hmm...we have a problem so went to log into the modem and my usual admin password is rejected...huh.

Tried the default Telstra password and that worked - something not right here ??? Clicked the button to restart the modem and again had to use the default password to login and voice line still not working. OK go downstairs to my study and pull the DC power plug, wait for a bit and power up.

Voice line now working OK but still have to login using default password so went to change that to my usual admin one which was rejected saying has to (now) be 12 characters long, I think previously 10. So likely a overnight auto update that's stuffed a few things and also reset whatever the current password was back to default - not good.