Yes, you can, I unbranded mine and then install the stock version of Froyo OTA (the one with sense).
Sorry can't answer the 2nd question properly but I rooted mine and when I did the OTA update I lost the root access. But you can downgrade to 2.1 if you aren't happy with 2.2
#6458928, By Toori Android hardware
Toori 432 posts
Seen 6 years ago
Registered 10 years ago