How to flash phh gsi and root on Vankyo P31 (using unisoc sc9863a)

[MixSens]

Hey all,

I have a Vankyo P31 running on Android 10, it has a unisoc sc9863a ,I wanted to flash gsi on the tablets as they usually dont get any updates and the security patch is stuck sometime around 2020,

I was able to unlock the bootloader using hovatek's modified fastboot tutorial.

The real issue lies in the fact that I am not able to find firmware files for this device anywhere at all 😭 (as magisk needs boot.img for patch) and these devices don't have twrp builds

Also btw it has ramdisk support

Can anybody suggest on this topic.Thanks for your time 😀

ps: tried flashing magisk also via adb sideload, ends up at error 21 signature verification failed

[winzkh]

You can try using a DSU Sideloader to sideload the root with SuperSU and extract the device's boot.img from it.

[MixSens]

Sorry for the late response

I tried the dsu method, only for the tab to reboot and boot back to the stock rom😭

I also tried flashing it via fastboot, it ends up with errors like
-data too large
-unknown command

The commands I entered were correct as they worked while flashing on other phones

on a side note, these devices don't seem to have any hardware (button combo) way to directly boot to recovery or fastboot mode, only the adb reboot method works

Thanks for your time😀