$ mtp-filetree
Device 0 (VID=0502 and PID=3644) is UNKNOWN.
Please report this VID/PID and the device model to the libmtp development team
Attempting to connect device(s)
Android device detected, assigning default bug flags
Device: E39
Storage: Phone storage
It's an Acer E39 Android Phone
Anonymous
the id was added in the libmtp 1.1.10 release, thanks for the report!