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Yes. warranty does not affect even if you unlocked your phone.
NVT-S panal still has touch issue since touch has fixed only for FTS panal. The devs are working on fix for NVT-TS. So replacing screen to FTS panal might help.
But I do not have any touch problem even though my panal is NVT-TS. I think some people have some people do not have.
I'm on fts panel and there is still ghost touch from prev beta I'm testing new beta now.