Please help to get back to stock - Sony Xperia XZ Questions & Answers

Hi I've been trying to get back to stock as I have been having problems with both stock based custom roms (random reboots and not detecting sim card). I have restored my TA partition via TWRP/ADB and then have tried flashing stock via EMMA but error message that bootloader is locked appears.
I have then tried flashing Nougat rom UK customised via flashtool and it does flash however when trying to boot it says update failed and to reconnect to PC
I have tried connecting to PC companion however it keeps repairing with Software version 39.0.A.1.213-R3B which is marshmallow based and does not allow for any updates (Security patch July 2016 and think software is up to date).
Please any suggestions

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My issue is that I have an xperia m2 with cm11 running on it. I dont quite like it so went to flash a stock rom to the device but it fails.
It comes up on flash tool saying error (with a blank message) then underneath it says error flashing failed.
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I have tried different roms. Uninstalling flashtool , pc companion and drivers, thwn reinstalling but nothing works

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