One thing to note, is sometimes these TV box companies host their update ROM's on Chinese Firmware hosting sites, which in my case my ASUS router would flag it as maleware site and not download OTA updates. So to get around that with Android 9 you go into settings and use Cloudflare DNS in the Private DNS setting input one.one.one.one
If that doesn't help, look for a custom ROM that works with your device.
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