If i jailbreak my iphone and restore it will the warranty be void?

I know that if i install an update while its jailbroken it will void the warranty but if i jailbreak it and i want to install an update can i restore it, install the update, then re jailbreak it without voiding the warranty?

If you restore it no one will ever know that it was jailbroken before. Just don't tell Apple yourself:/
So to answer your question - No, it will not void your warranty

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