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I've been beating my head on how to do updates in recovery. The update process itself is unbelievably complicated. The device-mapper is heavily involved. I've had to do a deep dive into that (mostly undocumented) subject. My usage case is to be able to take a heavily modified system, restore it to stock with a full update, then update it with an incremental update, Of course your own rooting/modifications have to be performed again adapting to whatever changes were made. I just got 3.5.1 and 3.5.3 installed 100% ok, but I get a 900e (system crash). Oh, well, reflash to the last full backup.
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