I have just upgraded to 1.66 from 1.43 (I think). First attempt at running the upgrade failed because of a lost connection. It seemed to install a new bit of software on the PC. Coloured bands appeared on the screen of the HTC.
I started again and this time it went smoothly and all was well.
I then restored SPB backup from the storage card and it appeared to be OK but once it had reset itself it could not reload the "HTC Sense" front screen. I took the battery out and then retried. This time it worked fine.
Sweaty armpits for a while but now I'm calm again!
John