Hey everyone - reddit is usually a cool place to get advice for things like this so I wanted to try asking.

I read the initial post of this subreddit....and realized I have a T9 android TV box bought from Amazon, a paid a decent amount of money for it ( https://www.amazon.co.uk/gp/product/B07K76QB3J ), but it falls into the category that is not an android tv os box and just runs a custom android version which is pretty horrible, Netflix doesn't work on it, there is no voice control capability through a voice remote I have bought separately, bad wifi connection and several other deficiencies.

Having had a proper Android TV Box before, I want to get back to that experience and have the vanilla Android TV OS on the device, but am not 100% sure how to go about it (or if it is possible). I have seen instructions online for flashing images onto the device, which I'm fine to do, but with little knowledge about this area it's hard for me to select which one is best and I don't want to go bricking the device.

So, a few quick questions for anyone willing to spare the time:

1. Is Android TV OS open source and free to download? Are there any licensing restrictions for flashing it on a device I have properly purchased?
2. How can I get the latest legitimate Android TV OS image, and know which sources are trusted?
3. Are there other open source alternatives people can suggest that I can flash onto the device to get an experience similar to vanilla Android TV OS?
4. How can I tell which images are right for the particular device I have? All I really have on the device is the label "T9" and a serial number (and the purchase link above).

I am just hoping there is a way I can get the vanilla Android TV OS on this device but am looking for some direction on where to get started, any advice or help is much appreciated!