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Mender should be pretty immune to power failures in the middle of the updates -- even if second partition is only half-written , it is still not activated.

OSTree seems to rely on underlying filesystem to provide protection from power failures. This is, in my experience, is not a very reliable mechanism, especially when the SD cards are used. Thus, it is likely that if you have a device using OSTree updater and someone yanks the power cord at the bad time, your device may become unbootable.

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