On my phone, the vol-down + back-button doesn't work either. It just resets the phone as normal. A vol-down + enter-button does move it to the hard-reset screen though, then an up-arrow finishes the hard reset, but not loading the DIAMIMG.nbh file. Maybe they removed the vol-down + back-button? Or changed it somehow?
AT&T Tilt & HTC Fuze
Running "ROM of the day" via xda-developers
Are new PDA-Phones really that
The phone on the right is the original Motorola flip phone.
Cell phones until only a couple years ago really were not that much smaller. So if anyone comments on how big your PDA phone is, just laugh.