Only ROMs which are SIGNED with the correct keys known only by the manufacturer will be able to update/flash write the contents to your box. For the cases of custom ROMs that you find around this site, you'll know that the developer will tell you which box's original stock firmware he use to work on. If he says it's he's from Mecool, Tanix, Beelink, Ugoos or whatever brand, the customized ROM inherits the same decryption SIGNED keys that the original stock ROM which was used for to make his project. You have to start from somewhere, not out of nowhere.
In the case of open source projects, the roms used by the manufacturer on their boxes are encrypted by PUBLIC released keys meaning any developer can acquire them publicly to SIGN their own customized ROMs.
These China TV boxes aren't open source, every brand and manufacturer need to protect their own development works and interests. They won't entertain rogue developers because who knows if some of these rogue developer is a spy for another company and steal their source codes after using their keys to decrypt their stock ROM contents?
TANIX is not stupid to spend money and develop a dual boot Android OS/LibreELEC ROM only to be stolen by another unbranded competitor and helping your rival to boost sales?
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