Hi Guys, I am getting a new Sony Xperia Z1 on Monday as part of an upgrade. The ROM on it will be branded (Three Ireland). I would like to put the official Sony Xperia Z1 unbranded ROM on it. Is this possible without rooting? I believe Sony has instructions for unlocking bootloader, do I even have to do that? Sorry for all the questions. I am reading through a lot of threads here and just thought I'd post at the same time. Thanks in advance for replies.