Instruction For Firmware update:
1, extract the zip file, and copy the update.img into the DX90;
2, once copied, safely disconnect the DX90 from the computer;
3, select Settings--->Advanced--->System update (the system update option appears only after the update.img is inside the DX90);
4, click ˇ°OKˇ± to start the firmware update;
5, the DX90 will reboot after firmware update completed. 
6, select Settings--->Advanced--->Factory Reset to reset the DX90.  This is to avoid conflicts with residual settings from the previous firmware
7, delete the update.img.




Improvements with this firmware:
1. Support for ISO files.
2. In Directory view, allows the pressing of the thumbnail of folders for additional features.
3. Updated FLAC decode engine.
4. Updated WAV decode engine.
5. Updated DSD decode engine.




