The Mars I have is fine. Some Android apps work quite well, some are inexplicably ghastly.
The stock ereader is great for PDFs.
It's had two updates since I got it a few months ago from Germany, with Android 8.x I've had none on any regular Android device in more than 6 years and no support from Lenovo, Alcatel or Sony.
I've had no sensible support from Kobo or Amazon with their ereaders, good support HERE!
My S/H Sony PRS350 was long past Sony support but there is support here. I got one update as the FW was original.
I've actually avoided recent updates on one Kobo and instead update my older one.
It was simple to install the KOReader APK via the built in browser on the Mars. Their "app store" version was out of date.
The best gadgets don't need updates or vendor support. But Boyue do seem to fix bugs and shortcomings and do updates.
There is some support from expert users here.
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