- The DRM Fix or Xperifix solve any feature problem or are there any functions that are irrevocably lost?
- Camera, Bravia engine, Track ID (this still available?), Noise Canceling, PS4, , Xreality, 4k video recording sony bass surround, screen mirroring and image enhancement have stopped working though when rooted?
- The OTA updates work?
- xPosed work?
- what is the benefit of using alpha Xperifix of other DRM fix rom?
- Do it is possible with XZP to downgrade to Android Marshmallow, backup drm and root it?
The DRM keys on your phone are lost forever when you unlock it. The good news is that Xperiafix fools the phone into thinking that DRM is in place, so all the higher functions still work as stock.
DRM is broken or fixed, the camera is broken or fixed, it's common misconception to think that there's a half way point where there are bad or distorted pictures or loss of quality or service..
The down side to rooting is that updates are no longer automatic and any firmware update has to be completed manually, which involves flashing multiple files.
I have root on my XZ1 compact (thanks to sToRm//'s Xperiafix) everything works perfectly, but the proccess of chasing the various firmware updates is so tiresome that I have given up.
Xposed will only work on firmware from pre May 2018. So if you have the latest firmware on your phone you will need to
use Emma to downgrade your phone to an earier firmware, this isn't so easy. Installing Xposed means that you will fail any sort of security check, don't complain when Googlepay doesn't work.
If you are determined to root your phone I would advise paying $20 for sToRm//'s
Xperiafix. It's the simplest way to do it and his version 3 has come along leaps and bounds from the early versions and as long as you get the right drivers (err, no easy task) and can follow instructions, you'll get there.
There are other DRM fix options available, but they involve flashing multiple files and sometime the instructions are not so clear, or support not so good if you fail.
Whichever version of the fix you decide to use, you need to know that the developer is commited to supplying all the modified files for you to reflash every time there is a firmware update.
You can go back to an M build, using Emma, but I'm not sure you'll find ina DRMfix file for an old build and if you do it will be tied to a particular firmware/region/version number. This will be the most difficult bit.
There is no backing up the DRM!