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DTR1 – Firmware build ver. 20190601 (ver 2.11)

Updates:
1) Adding Mid Gain option for Earbuds
2) New wake up option during screen lock
3)  Fixing channel swap issue for minority cases

Instructions to update firmware:
put update.zip file in the root folder of your SDcard, (FAT32 format needed). 
Hold the ''Down'' button and turn on DTR1, do not release the ''Down'' button and you will enter the updating screen. Await for the system to automatically update and restart.

DTR1 – Firmware build ver. 20190601 (ver 1.44)

Instructions to update firmware:
put update.zip file in the root folder of your SDcard, (FAT32 format needed). 
Hold the ''Down'' button and turn on DTR1, do not release the ''Down'' button and you will enter the updating screen. 
Await for the system to automatically update and restart.
DTR1 – Firmware build ver. 20190415

Instructions to update firmware:
put update.zip file in the root folder of your SDcard, (FAT32 format needed). 
Hold the ''Down'' button and turn on DTR1, do not release the ''Down'' button and you will enter the updating screen. 
Await for the system to automatically update and restart.
DTR1 – Firmware build ver. 20190210 (ver 1.10)

Instructions to update firmware:
Hold the ''Down'' button and turn on DTR1, do not release the ''Down'' button and you will enter the updating screen. 
Await for the system to automatically update and restart.

Update log:
1. Modifications on setting page layouts
2. low gain/high gain debug – fixing vol. jump issue during switching
3. non-linear vol. adjustment for fine steps of vol control
4. fixing display of device storage size when there are no card inserted