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you can flash factory images using the batchfile in the firmware archive or using MiFlash. You can also flash in Snapdragon EDL-(Emergency Download) Mode (bootloader unlocked is necessary) by typing:
fastboot oem edl
1. Relocking bootloader without root restore the warranty.
2. If you need authorized technical services, you can't fool the service center, they will ackknowledge if the phone is rooted or not.
I mean, I unrooted my phone, and there's no way they can find, it was ever rooted....now I have an issue with my screen(ghost touch) and I feel guilty to fix it, using warranty, if unrooting doesn't restore the warranty...