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Proof?
Here check this out, that is how I did mine when I first got my phone. Haven't had any problems with my phone, all you need to do is unlock the bootloader. I received the 4.0.2 already as well.
How to? Change from yakjuxw to yakju - xda-developers
happy nowand this is for unlocked GSM GN right?
Really up to you, im in canada too and had yakjuux as well.
Did the process from xda thread and within 10 minutes recieved 4.0.2
i dont think it voids the warranty. But im not the person to ask