I for moment stop to doing anything, because I go to one way road - for now I don't have eny idea what else I can do....
For now I can share to you what can I go for that tablet:
1. You can unlock bootloader that it write in this post:
https://www.hovatek.com/forum/thread-32287.html
2. You don't need to write vbmet and sing in so I go that way and it not work.
3. For me is work only flash singin boot for magisk - how to do it:
- I unpack my firmware in SPD Research Tool R21.0.0001(is on this forum - firmware:
https://1drv.ms/u/s!AtprAlErUyChnUvhHHq0...S?e=KYfuPZ)
- I copy boot to P80H and Instal last Magisk app:
https://github.com/topjohnwu/Magisk
- I choose somthing like repack and send and choose my boot.img and install.
- On that same folder I have got magisk_patched_.....img - I copy that file to my Linux AIK folder (form
https://forum.xda-developers.com/attachm...1590190221).
- In my Linux Mint I used unpackimg.sh and command to repack:
./repackimg.sh --origsize 23000000
- I have got img-repack.img or somthing like that - I change that name to boot_magisk_patched_repack.img and copy to my AVBTool folder
- I use from that post:
https://www.hovatek.com/forum/thread-37632.html numer 5 on list - your-key.pem I used renamed hovatek.pem for number 4 that post:https://www.hovatek.com/forum/thread-32664.html
- when you don't have eny errors that is know you are singin boot_magisk_patched_repack.img
- and now what I search in my own - you can go to fastboot from adb and is so we all know it, but we have that tablet who get to fastboot from recorvery. Yes is weird, but it works for me. You can go to our recorvery from adb:
adb shell reboot recovery
- when you go to recovery you have got: go to fastboot or somthing like this and when you use you have see that you connect as Unisoc Phone - i just go with adb universal driver. You see that is write there:
secure boot: yes
and for now I don't know what we can do it to change it.
- but in that fastboot I used command:
fastboot oem unlock
- and flash my singin boot command:
fastboot flash:raw boot boot.img
- and it work but for now you can only update your magisk app - install magisk is not work.
- maybe is a way to install magisk without install not signed boot but I don't know it.
Sorry for my language but I form Poland and very tired to write this.