[Q][Magisk Manager] rooting an unidentified tablet with android oreo 8.1 troubleshoot

Goodday,

I have been looking into rooting my android device for over a week now and was still not able to find how it can be done for an unidentified tablet.
I have an Allwinner T8 tablet (headunit) that runs oreo 8.1.0, theres no info availlable on this unit whatsoever, all i have is a detailled system information gathered by root checker, i can post the detaills if its required.

I've managed to make a full backup of my device using the adb backup command incase something goes wrong it can be reverted easily.

No custom recovery option availlable to flash.
Is it possible to root my device using the supersu zip without a custom recovery for example with adb using the command "adb flash"?

The most usefull guide for my situation i have come across is the magisk manager installation guide: ht tps://forum.xda-developers.com/apps/magisk/official-magisk-v7-universal-systemless-t3473445
This method requires me to have the stock boot image from my device, seeing i don't have root and cant just copy that file, where exactly can i find this file(whats the path to it)?
Is it possible to use adb command "adb root; adb pull ... " to retrieve this file? If not how can i get my hands on this file?

Please help me, i have spend many houres searching google and watching videos but all of wich are the easy methods that don't work for my tablet or require root or a custom recovery wich i cant install... pretty frustrating...
I think magisk manager is the only correct way to go for my problem

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