It's kind of funny, I reinstalled my prerooted 6.3.3, a couple of weeks ago, and still hasn't tried to update.
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I turned on my kindle for the first time in about a month last night and then overnight and about 5 times this morning, each time it booted up it would try to update. Basically a bootloop. Thanks for the link, 6.3.4 is working great once again!
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