In need of manual Max Carta 13.3"

Goodmorning,

New to this forum and I hope one of you can help me out.
The other day I purchased a second hand Onyx Boox Max Carta 13.3" for a very reasonable price.
I intend to use the reader merely to read my music scores during rehearsels, but I won't rule out other use.
Unfortunatelly the reader came without manual.
Of course I could find out everthing myself by trial and error but a manual is very convienient.

Is there among the forum users one who can send me such a manual (PDF).

I would be very grateful.

Greetings,

Berend Klompsma
Winsum-Groningen
The Netherlands