TM updated my router to 7.17 and broke my access to the operator account via ssh. I need it for iptables and now I am stuck.

Does anyone know the operator password on the stock 7.17 firmware please? Or how do I downgrade the firmware? I noticed that there's no option for me to downgrade the firmware from the web administration interface.

Anyway I have flashed DD-WRT onto a generic DLINK DIR-615 router instead for my needs of iptables. Don't want to risk another round of update by TM and break my stuff ...