[FXB78]

Thanks for the quick response,

One more clarification please...

Can I independently update both firmwares? (Android & CoreELEC) or should I stick to the official only?
OR
Can I update CoreELEC on my own?

The dual boot firmware creates two separate partitions so independently updating shouldn't be a problem. I've done Android OTA updates & CoreELEC updates without any problem. I've not tried flashing Ugoos firmware as I mainly use CoreELEC, so can't confirm that, but OTA Android is fine.

You mean you are not using Ugoos stock firmware?

I'm using stock Ugoos dual-boot firmware, it's the only way to use CoreELEC. But I'm using OTA updates for Android rather than flashing the updates, because I think doing that will reset CoreELEC to an old version.