I have the same problem with my Dinc. It has never had an OTA update, as far as I can tell. I tried to load Froyo manually back in October, but I wasn't able to because I was missing an earlier OTA. This is what my phone is running:
Firmware version
2.1-update1
Baseband version
1.00.03.04.06
Kernel Version
2.6.29-cc1c2268
htc-kernel@and18-2#1
Build number
1.22.506.0 CL161493 release-keys
Software number
1.22.605.0
Browser version
Webkit 3.1
PRI Version
1.28_002
PRL Version
52257
ERI Version
5
Can anyone help?
Thanks