I've been running 4.4 on a T68+, M96, and M96+ ever since they first released it. I believe it's gone six months before I inevitably fiddled with something and broke it or decided to take a look at the 4.0.4 firmware. I know some folks have had no luck with it, though, and I've sometimes had to flash it a couple of times in a row to get a stable flash.
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