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Blah. Who cares about the warranty mumbo jumbo. They have to prove that you broke the phone by installing unofficial software and if they can't prove it without a doubt then they can't deny your warranty.
Besides there's always ways to go back to stock and they won't have any clue. And you don't need to be rooted to do the 215 update so that supposed root check doesn't matter.
Go for it, you won't be disappointed. Gps is the main reason I did it originally. Locks in within seconds