I connected my Sony Xperia Z1 compact with mtp-connect and got:
libmtp version: 1.1.3
Device 0 (VID=0fce and PID=01a7) is UNKNOWN.
Please report this VID/PID and the device model to the libmtp development team
Android device detected, assigning default bug flags
I hope this helps you. In case it does not help, dump it.