Minor nit: front-light not back-light.
The Meebook brand seems to be a reboot / relaunch / take-over / whatever of the Boyue Likebook brand.
Your M7 sounds very similar to my 7.8″ Boyue Likebook Mars Android eInk (also called Model T80D). It's got those screen/refresh settings, but no physical buttons apart from power. I have a 32G SD card in the slot.
It has a very good PDF viewer but a poor epub viewer so I installed KOReader apk directly via WiFi from Git. It also now has Musicolet MP3/Audio book player (BT or 3.5mm jack), also Libby, Borrowbox, Kindle Kobo and GooglePlayBooks apps as well as Lchess and K9 mail for real POP3 & IMAP & SMTP email without it going via Google's servers (the stock Email on Android).
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