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File

Firmware + bootloader

Unlock Bootloader

1. go in settings and urn on developer option
2. unlocking "oem"
3. activated adb 

adb reboot bootloader

fastboot flashing unlock

on device  press volume down (you have 3second)

fastboot flashing unlock_critical

on device  press volume down (you have 3second)

Flash Bootloader and Firmware

cd ~/rooting_tablette/Firmware/T811MAN

install Bootloader

fastboot flash boot magisk_patched-27000_MR09X.img

unlock Bootloader verification

fastboot --disable-verity --disable-verification flash vbmeta_a vbmeta_a.original.img
fastboot --disable-verity --disable-verification flash vbmeta_b vbmeta_a.original.img

install Firmware

fastboot flash super superRW-WORK.img

Clear partition 

fastboot reboot fastboot &&  fastboot erase userdata && fastboot erase metadata && fastboot reboot

on device when in reboot on fastbootd choose "Reboot to bootloader"

Force reboot at end

Finish installation

1. go in settings and urn on developer option
2. unlocking "oem"
3. activated adb 
4. install magisk and launch app

adb install Magisk-v27.0.apk