This is what I have done to root my Teclast T8 with Magisk (based on this chineese forum: http://tieba.baidu.com/p/5449087481)
1-First download the official firmware from Needrom.com (You need to register): https://www.needrom.com/download/teclast-t8-e8c1/
2-Go to the Firmware folder and copy the “boot.img” file to the root directory of your tablet
3-Download and install MagiskManager on the tablet, click on Install, then choose to patch the boot image file. Choose the boot.img you’ve just uploaded to your tablet and it will start to automatically patch it.
Then go into the File Manager and go to the MagiskManager folder and find the “patch_boot.img“ and copy it to the root directory (without copying it to the root directory, you can not find the file from your pc…), then sends the file from the tablet to your computer.
4-For me the method with SP Flash Tool don’t work, because it says the scatter file is wrong (don’t know why…)
So i have to do it with adb and unlock the bootloader first:
-connect the tablet to pc, (first you have to enable OEM unlocking and USB debugging in Developer options)
-reboot the tablet in fastboot mode, hold buttons “power+Vol +” at startup, choose fastboot mode with Vol+ button, valid with Vol-
- open a command prompt in adb folder, then “fastboot devices”, then “fastboot oem unlock”, it should say “OKAY, finished”
Your bootloader is now unlock.
-then copy the “patched_boot.img” in the adb folder and tap in command prompt “fastboot flash boot patched_boot.img”, then “fastboot reboot”.
Your tablet should be rooted.
I think you can relock bootloader after... don't try yet.
PS: This is my first thread, so be indulgent 😊
Don’t ask me technical questions because I am not a developer , just a simple user …
Hope this will help.
If someone find a way to find and flash a TWRP or how to install Xposed, please tell me, thx.