It's hard to get any solid info with these strange devices. There's a hands on review in Nov 2019 (GoodEReader) of the Onyx Note 2 mentioning it running Android 9. To blame Covi9-19 on the failure to roll out the OS upgrade doesn't ring true. They've made a number of regular firmware upgrades and promised the Android 9 update a couple of times well before this current crisis.
Excuse me for being personal but why are there folks on the forum who have multiple Android e-readers from different manufacturers? They are clearly painfully slow - reminding me of early pc's where you could almost make a hot drink while waiting for them to be ready to go. Also, they are buggy and difficult to utilise fully. Are they given to folks in exchange for help with development or for maybe review purposes. I can think of little which would be less useful to make a collection of. At least stamps appreciate in value.