If you want see some files on the M92's screen or compare with A4, there is some old comparisons between M92 (firmware 1.6) and PocketBook. I insist, it's a very OLD firmware.
Many tests are done here :
https://www.mobileread.com/forums/sho...d.php?t=157607, there is many videos on Youtube. You can search "jbaach M92" on Google. Jbaach has a blog, the URL is in the forum indicated.
The videos shown in "digital-readers.de - Onyx Boox M92 - web page" are mainly the old videos (firmware 1.6) from Jbaach.