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My phone is wifi is not turning on it stucks at off position. I did master reset but still same. I think it s hardware problam . How to fix that?

You should be under warranty. Contact google costomer support and they will help you fix your problem or fix it for you, for free. If you cannot get warranty help, there isn’t alot you can do besides replacement of the the motherboard, which can be pricy for a new premium smartphone.