Rolled back to TH2 and deployed vcReg 1.5, applied Live Interop with success but I can't deploy the Tweaks app.ok all fixed up now. ill post new files and instructions again here
vcREG 1.5
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it allows restoring loading of old version of ndtksvc that allows unrestricted writing, if you've installed the extras+info update that blocks it.
go to templates, and choose "restore ndtksvc", hit apply, then reboot. now you can load vcreg normally and write to registry again.
for the 950/XL, the process is a little different. go to templates, choose "restore ndtksvc 950", hit apply. connect phone by usb to PC, go to "My PC", open your phone, then in the root directory where you see the folders Documents,Music,Pictures,Videos,etc... make a new folder called "ndtk". now in this folder you need to put a ndtksvc.dll file that you extracted from another lumia rom, like the 1520. put this file ndtksvc.dll in this ndtk folder and reboot. open vcreg and apply interop unlock. how this works is, we tell the registry to load the ndtksvc.dll version from this folder instead of the prebaked restricted one that comes stock.
@dorianmuthig has kindly provided a copy of ndtksvc.dll file in this post #332
I decided to try this "guide" for my 950, but after reboot vcReg complained about missing capabilities.
It happened twice, and I'm starting to think that the provided dll doesn't work.
Please note that the device was just reset and it has not connected to network yet, so no updated and stuff like that.