Hi,
Sorry for the late reply due to the National Day.
Regarding the app volume issue, it’s the system problem, sorry about this.
The factory ever tested the new firmware but it does little help. It may depend on the android board.
If you don’t mind, please just use the SD card or bluetooth to play music.
Regards

Statistics: Posted by Jammy — Fri Oct 07, 2016 10:03 am

Hi,
Sorry for the late reply due to the National Day.
The factory technician said, if you just flash the ROM and make the unit back to Android 4.4, after flash back to Android 5.1, it could not make the hardware key mixed. The only possible situation is that you also flash other mcu file.
Please tell us what kind of the mcu version on your unit.
Once we get the MTCB-KLD 4-V2.94 mcu file next Monday, we will send it to you.
Regards

Statistics: Posted by Jammy — Fri Oct 07, 2016 9:50 am

Hi,
Sorry for the late reply due to the National Day.
There still no news about the new DAB apk, sorry about this.
Did you mean that you want to install the older DAB apk?
If is, we also could not find it anymore.
Regards

Statistics: Posted by Jammy — Fri Oct 07, 2016 9:36 am