OK. I did the GB update a couple of weeks ago. Worked basically ok, had some random reboots, was a bit flaky but I liked it. Then my headphone jack died, so I need to return it and exchange it. I tried to SBF it back to 2.2 using the usual procedure.
It never completes, and starts rebooting the phone over and over and over. The error in the recovery mode says e: can't open/cache/recovery/command
I think the phone is roached, but I dunno.