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I guess it depends on the version of 2.2.1. You need to be on .340. Also, rooted alone won't prevent the OTA, but making changes to system files (i.e. freezing, renaming, or removing bloat) will cause it to fail.I'm confused. You're on 2.2.1. Why do you need to SBF?
You said you're rooted, that won't prevent you from getting the update.
I guess it depends on the version of 2.2.1. You need to be on .340. Also, rooted alone won't prevent the OTA, but making changes to system files (i.e. freezing, renaming, or removing bloat) will cause it to fail.
I guess I've gotten to the point of just assuming that they have done something with root that will cause it to fail. I've seen too many threads that go like this:
OP: My OTA failed! HELP ME!
US: Are you rooted?
OP: Well, yeah...
US: Did you freeze/delete/rename anything
OP: Well, just a little bloat, but I don't know why that matters
US: SBF to 340.
So, I just skip to the end.