[Xperia Z General] Akinaro:
I replaced my back panel with new one, from special warehouse that support most of repair services(half of typical price in ebay! but you need to call and order it by yourself)

And because of that I have few advices for people that gonna replace this panel, and no matter what you think, its better to do by yourself why? because you not gonna lost your phone for few days/weeks and most of service centers not gonna notice it if they gonna open your xperia because after removing back panel 50% of them put new one on your device.

You need few tools to replace this panel:

suction cup(something like THIS) I used one from old toy from my friend daughter ;]

hair dryer or put small wet towel in microwave in max power for 2-3min and then put it in plastic bag and quickly put on top of your XZ(you need to be quick if you use this method)

microfiber cleaning cloth

plastic stick with pointed end

hammer and bucked of water

optional:

double side tape

1. heat back panel edges with hair dryer or trick with wet towel, dont worry if its get really hot i found out that this glass conducts heat really good.

after you heat it use suction cup to raise a bit back panel, BUT DONT USE BRUTAL FORCE! because you dont use special heater do it few times: heat and rise, heat and rise... try to start from top of device to bottom. I manage to do this after third heating.

And remember you need to pull up, not in weird angle.

1b. if you dont like to playing soft take screwdriver and "remove" this panel... if you know what I mean ;] just remember not to stick that screw driver too deep, use it only to rise this panel and after that use soft brush(even toothbrush) to remove all small glass shreds from interior :]

2. use plastic stick with pointed end to remove all glue from edges of device and then use microfiber cloth to clean everything

if you have hair dryer, heat a bit edges so all moisture would disappear. Those edges should be almost like shiny plastic.

3(optional) ONLY IF YOU RELLY WANT, use small pieces of double site tape in this places:

[IMG="xperia z double site tape places"]http://s17.postimg.org/gp7dwcazz/maxresdefault.jpg[/IMG]

dont try using it on battery or other parts, because when you gonna remove it next time you could tear up everything!

4. if your new back panel dont have NFC antenna, using plastic stick remove it from old panel, after rising part of it it should remove easily(dont worry if it bend a bit, its not iPhone...).

Stick it to new panel just like it was in old one.

5. remove special plastic that cover your new back panel, if you dont have it, you bought peace of sh#t and you are screwed :P

Really, because original and good back panel have special glue on the back covered with plastic sheet. Its not typical glue but glue on sponge that is waterproof.

After removing it DONT TOUCH back of this panel, gently grab both edges of it and really slowly put it on your device.

6. using medium presure, squeeze every edge of your phone, then heat it up again using hair dryer or trick with wet towel, and then for few minutes squeeze everything again until its gonna be cold again.

7. pour bucked of water at your head and then grab hammer and scream like Thor calling lightning, because you just replaced back of your xperia.

And what about durability and waterproof?

After few days of really heavy work few times hitting ground(and I even few times sit on it) its still in place.

And if you used original back panel and you cleaned everything really good you should not afraid of cleaning your device in tap water/shower/rain or mud. I didnt only put it in deep water because I never did that even before replacing it...

Of course dont try this if you have no idea what you are doing, bla bla bla, at your own responsibility, bla bla bla.