Lol you can't add custom firmware to a locked device Casper .. This? Is very ez using splashtool mtk drivers , modified bootloader's . I did it on arch with micro c backwards after flashing unlock then you can use whatever u want Casper gl
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=== Update (02/23/2021) ===
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Or if you aren't comfortable with that vmos rooted version then wireless adb
Lol you can't add custom firmware to a locked device Casper .. This? Is very ez using splashtool mtk drivers , modified bootloader's . I did it on arch with micro c backwards after flashing unlock then you can use whatever u want Casper gl