My problem is that my M96 nearly seems dead ...
When I turn it on, it just shows the initial "splash" screen (BOOX Reader) and it doesn't allow any setting change, so USB debugging cannot be changed in any manner.
Maybe it could exist something like a key combination (or anything similar) to change the reader's state, but I don't know it (I'm not even sure it exists anything like that).
Moreover, the computer is able to see the device (Android), and it also shows two "drives" (E: and F

, but those two drives are greyed (in Windows) and I'm not allowed to interact with them