[Walmart Onn Tablets General] tek3195:
GSI's on the Onn 8"

That was not me on the SP Flash Tool, I hate that thing that's why my backup was done with TFM Tool. It's paid but there is a free version although without much functionality. The best MTK flasher that I have used has been Secret Tool Pro v1.4, when others fail it seems to eat errors and **** positive results. If at all possible I will pay for software before I fight with SPFTool.

The first GSI you need to get is AOSP from https://ci.android.com/builds/branches/aosp-pie-gsi/grid? You will need it for the vbmeta.img I flashed the the whole package and booted it set it up as a base starting point. There are some GSI's that instruct you to flash them over phhusson's AOSP GSI. Of course his AOSP performs flawlessly as expected. I saved AOSP vbmeta from ci.android.com to flash with the other gsi's as few of them are packaged with vbmeta or anything else other than system.img. Source.android.com is where I got my install directions and there is also a huge db of images at https://ci.android.com/builds/branches/aosp-pie-gsi/grid? updating live while your trying to look at their grid of pure stock aosp images.

https://source.android.com/setup/build/gsi#building-gsis or phhusson's instructions are a must read so you have the "fastboot --disable-verification flash vbmeta vbmeta.img" in the right spot at the right time. There are just a few commands but they have to be right or it won't boot. When you flash it you will think it is going to bootloop but its not actually a bootloop it is resetting something with metadata or ahh... I can't remember what it was but there is documentation somewhere about it. You get your unlocked Onn splash then boot animation then unlocked Onn splash and second boot animation varies by OS. Some are fairly quick others 5 to 10 min. maybe more I didn't clock them but I know DotOS took a long time as I was picking it up to use hardware buttons to get to recovery the welcome screen popped up and it worked fine and had normal boot time on reboot. Most of the maintainers say to flash from recovery but I done all of mine with fastboot as my recovery won't flash system.img it says it can't flash file systems, I dunno, source android's fastboot instructions worked for me. You can try any of the ones that didn't boot for me that you want as you may have different results depending on flashing method used. The ones that booted but didn't run well I would expect same results and therefore not waste time, but up to you. I would be very cautious of AOKP, which was The One that I wanted, I wound up with a soft brick three times that I tried it. That meant booting windoze and restoring full backup and starting from scratch. And yes, three times, I really wanted AOKP. That was the warning. Also note that I do not use gapps,all results are without google. I think two of them had gapps preinstalled. Don't forget to scroll down on each maintainers downloads page for specific intructions and gapps if you use them

NOT BOOTING:

/e/ ROM

EvolutionX

SuperiorOS

BOOTING BUT LAGGY, FREEZING OR JUST SKETCHY:

Treble-IzedOs

TitaniumOS

HavocOS

BOOT AND RUN GREAT:

Bootleggers ROM (discontinued but still in my top 5)

Liquid Remix

BEAST ROMS

ResurrectionRemix

phhusson's AOSP

AospExtended by NFound

ZirconiumAOSP

DotOS

Been using BEAST ROMS for 3 or 4 days and think I'm sticking with it for a while.Not maxed out on customization options but more than I use.

The most customization I found was with Bootleggers, AospExtended and Liquid Remix which would be my pick for customization, if I had to pick.

I apologize to anyone that may have experienced any problems with images in first posting. They and I stand corrected now. Sorry about that.