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This step will not restore drm keys its will restore which u have lost due to drm keys
After helping from croos devlopping
http://forum.xda-developers.com/cros…s-drm-t2930672
i found a way but it was not esy at all now after soo much try
i found steps
Needs
1 .download prf creater
http://forum.xda-developers.com/cros…9#post60604249
2 .make pre rooted zip file of latest 5.1.1 lolipop with recovery by prf creater
3. download xperia flashtool http://forum.xda-developers.com/xper…rsion-0-9-11-a
4. download this zip https://drive.google.com/open?id=0B1…nhqLTNnR090Mm8
5 PASTE preeroted zip and drm fuction zip into sd card
step 1 download latest lollipop ftf and flash via flashtool
step 2 lock your bootloader by flashtool
step 3-start your phone then switch off and then unlock your bootloader by flashtool .yes again !
step 4 – then re flash 5.1.1 and start and install ndr nuts dual recovery for your device http://nut.xperia-files.com/
step 5-then boot your phone into recovery and advance wipe – catch,dalvik ,data,system, internal memory
step 6- then install latest 5.1.1 prerooted zip which u have made by prf creater then wipe delvik
step 7-then install drn function restore.zip. which u have downloaded in starting
step 8 ready! reboot into system .NOW your phone has restored drm function .
step 9 hit thanks button if it works
this not my work i found that this in post but it was not like easy so i have describe it properly as for you it will easy to restore
click thanks button if it works
Attachment 3564955