Unlocking bootloader

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http://forum.xda-developers.com – I'm going to buy the n4 and I would like to unlock the bootloader and root it. Since I won't flash a new rom at the beginning, I don't know if I should root it, just because of the warranty. Will it be void if I unlock the bootloader? Enviado desde mi Transformer TF101 usando Tapatalk 2 (HowTos)