I DID IT. I F'ING DID IT. TAKE THAT, TAKE IT, RAT. I CAN NOW GO INTO MY /system COMPLETELY UNBLOCKED, ROOT MY DEVICE WITHOUT KINGROOT SPYRWARE AND DO WHATEVER TICKLES MY FANCY, WITH FIDELIZER CUSTOM, V4A, BLOAT DELETION, WHATEVER. I CAN NOW HAVE MY CAKE AND EAT IT TOO. WHO WANTS TO LEARN, BOIS?
YES, THIS MEANS TESTERS ARE NEEDED. I am doing this on an X7 Gen 1, but this doesn't mean X5 Gen III and X7 II can't have this as well! PM me, the more you're familiar with rooting and backing up/recovering your devices with Flashfire, RKTool and TWRP, the better. I need the latest version of each machine to test.
http://fiio.me/forum.php?mod=viewthread&tid=42663
I made this thread a few years ago, so there is a lot to be streamlined and updated, v4a hasn't worked since the 3.0.3beta when lollipop JUST got rolled out for the original X7. If you've used this guide, or any other one for your specific device before to rollback, flash kernels, custom roms, zips or updates, then you're pretty much qualified as a tester.
I'm going to make a tutorial for the X7, then I'll move onto other devices once people approach me about them.