SOLVED
I try downgrade firmware to 1.0.6.16 but still error, down again to 1.0.5.66 but cant solve the problem, reinstal & change app mi fit from playstore / mod but still not work.... after i uninstal mi fit, i see MB4 detected music again with only app notify & fitnes in my phone so i think...
its only me who get bug in Firmware v1.0.7.04 about music player ?
I cant detect what music play in phone anymore after use that firmware, so i cant change ( pause / next / prev / volume up / volume down) in MB4