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
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Registered 8 years ago