Just for the record ... in several
youtube videos, it has been demonstrated that the stylus delivered with "PocketBook Pro 903" is compatible with "Onyx Boox M92".
In another
youtube video, they use the same stylus with both, the "Ectaco Jetbook Color" and the "PocketBook Pro 912".
So, all of them should be compatible with "Onyx Boox M92".