@Renate thanks for indulging me. I opened the device (images below.) I don't know if there's an EPROM. Not even sure if whatever is inside is flashable. It does look neat.
Also figured out what the device is really doing.
Normal mode: the directional buttons act as a swipe. I know Kobo supports swipes, so wondering if it's possible to map the swipe actions to page turns using kobo-btpt.
Configure mode: the directional buttons slowly moves the pointer. Once the position is set, the camera button works like a click. This behavior is not that useful for my purpose but good for mobile apps and such.
https://i.postimg.cc/kDPVB7qC/Screen...7-32-34-PM.jpg
https://i.postimg.cc/XqCGjrMx/Screen...7-32-44-PM.jpg
https://i.postimg.cc/XJhB6wPp/Screen...7-32-52-PM.jpg