[HOWTO][ROOT]KM8 P 2GB/8GB S912 Amlogic TV Box Android 7.1, TWRP Root Instructions - Android Stick & Console AMLogic based Computers

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This is how I rooted my KM8P, using help and tools made by people far more awesome than me. Probably works for other RAM/ROM size variants too and possibly for Android 6 if you can get the TWRP for it.
1. Copy TWRP.zip and Magisk.zip file to SD Card or USB key. The Android recovery can read extFAT but TWRP cannot. FAT32 works for both.
2. Boot to Android recovery - hold reset and power on until logo appears Reset hole is at the front on the top face where the "KM8 P" writing is.
3. Apply update, from external.
4. "Install" TWRP (attached, for Android 7) - It will just load, not actually install. Optionally backup your ROM now or have a recovery zip on hand.
5. Install magisk from TWRP - I used 15.3 (attached) but feel free to try a newer one.
5a. I could not update Magisk via the manager so I flashed 17.1 via TWRP. (attached)
6. Reboot
7. Install BusyBox (Stericson)
8. Open Magisk Manager - Check for update
9. Donate a couple of bucks to topjohnwu for Magisk: https://forum.xda-developers.com/apps/magisk/official-magisk-v7-universal-systemless-t3473445

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This worked for my T95Z Plus with a few hiccups. I had to wire up the UART.
Since updating to 7.1 it won't boot to recovery from the reset button anymore. I had to use UART to get into the bootloader console (hold space while plugging in power) and execute "run recovery_from_flash". It refuses to boot recovery images directly from external media anymore, but by going into recovery this way I was able to execute TWRP (which starts up in Russian, but can be changed) and make a backup.
Next, installing Magisk ended up being a chore. I had to use the "create patched image" method. For whatever reason it refused to let me copy files to my USB stick, so I ended up having to split the patched image into chunks and email them to myself... anyway, TWRP was able to flash the image.
The final complication is that Magisk could only install to the recovery partition (no ramdisk) which means it's only active when booting in recovery mode. I was able to make this the default mode from the bootloader console by executing "env set bootcmd run recovery_from_flash" and "saveenv". After that, it boots up normally with Magisk enabled. I guess I don't have an actual recovery mode now, but I can use UART or USB Burn Tool to recover from bricking, so no big deal.
(Also Android itself was in Vietnamese but again this can be changed)
Thanks for the files and guide!