The built in reader is OK for PDFs, but download and install KOreader for a hugely better epub reading and browsing experience. Can be done from Git on the built-in browser. The ARM apk.
Fortunately my Mars came with Android 8.1, but it's had 3 or 4 updates over WiFi since. Two immediately on adding WiFi key.
One tablet and one phone here has 8.x and one tablet came with 9.x and shortly updated to 10. IMO there isn't much difference 6 and 8 (I have two old phones with 6) but in many ways 9 & 10 seem backward steps.
My son's Xaiomi phone has 11, no advantage over 10. Main difference with 6 vs 8 is that some Play Store Apps won't run. I thought actually more that was the case, but the two 6.x Sony phones have different specs and most apps that no longer are available for the older phone still install in the last month to the newer 6.x Sony phone.
I don't use the Kindle paperwhite 3 at all now except for Amazon purchases. I read all epubs & annotate on a Kobo Libra (original), far better than Kindle or Mars for ordinary ebooks. Calibre converts the Kindle titles.
I use the Mars for Belinda Borrowbox (The county Library system) and epubs badly formatted I can't be bothered fixing. PDF Datasheets on the 10" 1920x 1200 Lenovo Yoga and the Mars used mostly for scans in PDF of old PD novels and reference works.
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