With https://github.com/JunioJsv/mtk-easy-su/releases/download/v1.1.3/mtk-easy-su-v1.1.3.apk and the Magisk app as the "granter" you get root on the Lumigon T3.
No flashing, no adb shell, no fastboot, no SPFT, no nothing. No tutorial either btw., but with a little search for mtk-su there are...