Unrooting is the same as rooting, you're just flashing a stock ROM.
Last time I rooted my old phone, it took me weeks of research to unroot it. For some reason it was having an error when I try to flash a stock ROM. Even tried OTA update with same results. Almost threw my phone out in the road (road rage... hehehe). Eventually succeeded in un rooting, but after that I swore never to root my phone again.
-Sent using the force
Pre, may sindi ka?