[SuperSU] estofjlw:
1. I flashed SR5-SuperSU-v2.82-SR5-20171001224502.zip - and booted it on BATTERY power only - it "optimized" ONE app the first time through and the "media mount" had returned. BUT when I unplugged it and rebooted - it popped back up optimizing 71 apps. while it is doing that - there is no charging power working and it discharges the battery - AND the second time in - the media mount was GONE again. I unplugged it - and rebooted on battery power all the way back in and the "media mount" was back upon plugging the device into the computer USB cable, and on battery power it did not "optimize apps" AGAIN. HOWEVER - now it does not autostart with a "open files to view" option dialogue in Windows - and when I select the device via "media mount C9F9" - it may display NOTHING at all - until I back out and come back in again. If I "power off" by unplugging and then power off - and plug it back in - it will now boot again without "optimizing apps"

2. From what I can see - to use the SuperUser => UPDATE-unSU-signed.zip to uninstall "SuperUser" looks like it does not uninstall just the APP - and would require completely un-rooting the device - and according to jcmm11 - I should then re-install the stock kernel - which means for me basically a complete factory reset anyway.

I do not want to do that - and as I said originally I simply push up a new system.fls file from the Teclast firmware file using the Intel Download GUI tool which will push files to the phone upon reboot (even if it looks like it is "bricked") and it does not disturb anything else, depending on which files you push or apps currently installed - but to re-root I just make sure the bootloader is unlocked again and boot back into recovery (TWRP) and flash which ever one of the SU.zip apps I want and root is back.

The Teclast x70R is a strange little "phablet" device - it was hard to root - but is also nearly impossible to "brick" - but if you mess with things in the system - it will just not work properly (like trying to get it see an ad hoc wifi network) and one has to put the OEM system back on. It has the "Sophia" Intel processor and requires special drivers available only a few places on the web and you would think the other Intel drivers would not install - but they do and just do not work, so I trust very few scripts that hack around in the system. ( See https://xdaforums.com/showpost.php?p=73586701&postcount=165 ) The Dalvik cache locker app - froze the device in the "power on" position and I had to split the tablet clamshell to reset it by breaking power to the motherboard. That is the only thing that the Intel Download GUI tool cannot do.

Also it requires a 2 amp minimum USB feed (like from a cigarette lighter dual USB outlet charger where one is labeled 1 amp and the other is 2 amp) - which shows up as "AC charging" to keep from depleting the tablet's battery while operating - or running video like displays

I have it set to never sleep while charging - but now - it started going "DIM" - instead and some apps still let it "sleep" - requiring a push of the power button to bring the display back until I had to set it to NEVER sleep. It is used in a vehicle as a real time gauge and diagnostic system with info from the vehicle ECM - and other things like a Compass - GPS tool - Radio etc; so I need the properly operating granular control that ROOT can provide.

I can either push the power button to turn off the display temporitly for going into a store or etc - or power off the cigarette lighter outlet with a switch and then power the device off - and as soon as I flick on the outlet again - it will boot.

So perhaps someone should address the issue of the SU zip updater file that is on Google Play - which started this nightmare - and I am going to search for a way to STOP Google's update crap and business with all it's unwanted noise, as it seems they keep hiding ways to make them leave you alone - as I do not see anyway to easily stop "Google Play" from updating - and eating my bandwidth and screwing up my setup - when I do not want them in my life pretty much AT ALL, so it looks like it is time to start tracking down and disabling services.