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somenone who knows please tell me if is this available for the Z1? http://www.androidpolice.com/2014/10/02/unlocking-the-bootloader-on-sonys-xperia-z3-and-z3-compact-c...
You want to know if what is available? - The loss of some fuctionality then the answer is yes
is there a way to get it back? cause i dont had any message about this thing when i unlcked my Z1 with the official sony's method and i did not backuped any kind of TA partition... 
You would of had a message or you would have had to tick a box saying you understood the risks before proceeding to apply for your unlock key,
Once you have unlocked then your DRM keys are lost unless you obtained what we call a half root and proceeded to create a TA partition backup - Please note you can not import to your device someone else's TA partition backup as this will render your device as a hard brick meaning it is literally no good
my friend unlocking my bootloader without backup my drm keys now the x-reality is not working.if i go to sony centre will my drm keys get fixed?