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This question already has an answer here:

I have updated the samsung galaxy s4 OS from Kitkat to Lollipop using system update. Now I want to hard reset. Does anyone know that after the hard reset Lollipop OS remains or it reverts to Kitkat?

marked as duplicate by eldarerathis Apr 19 '15 at 23:51

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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Hard resetting simply removes all of your data and apps to make the OS like you installed it. If you wanted to revert to Kitkat you would need to flash the ROM.

So no, hard resetting does not revert to Kitkat.

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