DRM keys are still on your phone if previous owner didn't tinker with it before, or if he backed them up, and restored them properly. These keys are only functional on stock ROM, they will do nothing on custom rom, or they will even break things on custom rom, because they aren't meant to be there (I am not sure about that, never tried it). You can follow old guides, this phone is old, so the guides are also old, but not outdated - there wasn't any new stock updata since android MM. Wether it is needed or not, I would say it is not needed if you plan to use only custom roms and never come back to stock, but if you want to go back to stock at some point for wathever reason, you would need TA backup, to have the exact same experience as before unlocking bootloader. If you don't do TA backup, you will lose your unique DRM keys forever. Personally I would back them up, because it doesn't cost anything and can come in handy in the future.Hi guys,
before opening the bootloader on my newly bought Z3 Compact in order to run LOS 17.1 then I'd like to ask the following question: Is it still even possible to backup the device's DRM keys from the TA partition? In case it's still possible is there an up-to-date how-to available somewhere? All I found seemed outdated to me. In case DRM key backup is still possible I wonder if it's still needed at all since reading across this forum and a German one I got the impression that at least in the past LineageOS had implemented something which basically out of the box gives near Stock-ROM-camera-quality which is all I care about in regards to the DRM issue. So is that still the case or did Sony intervene in the meantime and prevent that?
Thanks very much for reading!