[Q] DRM function restore topic

I have read DRM function restoreration for UB thread and have some question . My z2 is unlock bootloader and lose Drm function like x-reality and Bionz if i follow these step
1. Relock bootloader using flashtool
2. Flash FW 17.1.A.2.69 ftf with TA partition with full wipe
3. Reboot

Is drm function will be restore? Because i didn't care about unlockbootloader and sony warranty I just want X-Reality,Vivid,and Bionz came back. and if this work can i flash 4.4.4 after.
e.g. Sorry for my bad english