So I just picked up a Z and it's on 4.1.2 and I want to upgrade it to 4.3 but am having a spot of bother. The guides out there are pretty bad. I've put the 4.3 zip on my phones SD but I cant boot into recovery mode holding the power button and volume up or down. have also put the usb debugging thing on. I take it I need that Clockwork thing? How would I go about doing this? Model number c6603 android version 4.1.2 build number 10.1.A.1.434 Never had an android before and this does seem to be quite a lot of hassle just for an update as I came from the Iphone.