DESCRIPTION

I have prepared  hybrid ROM 1.04 / 1.05 (Android 9) ->  its  suitable for T1P2, T1P3, T1P4 version of Teclast T30

Its based on official global ROM 1.04 and chinesse 1.05 ROM.
In the folder with firmware 1.05, I replaced the scatter file and system.img from firmware 1.04.

The result is:
Version 1.0: firmware 1.04 with Google Play store and 60 Hz screen frequency, MUCH better touch response,  containing all languages.
Version 1.1:  same as version 1.0 + Magisk (ROOT)  pre-installed
Version 1.2a:  same as version 1.0 + TWRP 3.3.1  pre-installed

The big advantage of this procedure is the standard easy installation of the firmware via Flashtool.

Download:
Version 1.0 – Initial, first version (60Hz screen refresh rate), better touch response
Version 1.1 – version 1.0 plus pre-installed Magisk (Root)
Version 1.2a – version 1.0 plus pre-installed TWRP 3.3.1

Installation 1.0:
- Unpack FlashTools, and Click on Flash_tool.exe
- Select "scatter-Loading" and search MT6771_Android_scatter.txt in ROM
- Wait file to be added into Flash Tool
- Select "Firmware upgrade"
- Turn off your tablet.
- Press “Download” button to start
- Connect your tablet into the computer via USB data cable.
- The process will start and a red progress bar will appear after color purple, yellow.
- And green circles display
- Finish !
- Reboot System

Installation1.1:
- Unpack FlashTools, and Click on Flash_tool.exe
- Select "scatter-Loading" and search MT6771_Android_scatter.txt in ROM
- Wait file to be added into Flash Tool
- Select "Firmware upgrade"
- Turn off your tablet.
- Press “Download” button to start
- Connect your tablet into the computer via USB data cable.
- The process will start and a red progress bar will appear after color purple, yellow.
- And green circles display
- Finish !
- Reboot System
- Install Magisk Manager v7.5.1 or Magisk Manager v8.0.3

Installation 1.2a:
- Unpack FlashTools, and Click on Flash_tool.exe
- Select "scatter-Loading" and search MT6771_Android_scatter.txt in ROM
- Wait file to be added into Flash Tool
- Select "Download only"
- Turn off your tablet.
- Press “Download” button to start
- Connect your tablet into the computer via USB data cable.
- The process will start and a red progress bar will appear after color purple, yellow.
- And green circles display
- Finish
- Do not start tablet by normal way!!!
- Wait aprox. 20 seconds
- To go to TWRP start the tablet by pressing and holding the Power and Vol+ buttons simultaneously, until text menu on tablet will appears
- On the tablet screen, use Vol+ to select "Recovery Mode", confirm the selection with the Vol-
- To control the TWRP connect the mouse to the tablet, because touch do not work in TWRP
- Click Cancel when prompted for a password
- Click on Wipe / Format Data / Swipe to confirm
- On question enter "yes"
- Click Back (3 times) and click to Reboot / Recovery!!!
- Install "DisableForceEncryption_Treble.zip"
- Install Magisk 21.1
- Click Reboot System
- Install Magisk Manager v8.0.3
- To easy access to TWRP instal Recovery reboot application

Note. Unfortunately, the touch does not work in TWRP, so a mouse and USB adapter must be used

※Please make a backup of your device before installing or updating ROM