Shanling M0 Firmware V2.5 update

New firmware for Shanling M0 is ready, bringing new functions and some problem fixes. Please go to Download section of our website to download needed files.

Changes and fixes：

1. Added Lock screen, including user created backgrounds

2. Added new ways of connectivity for Bluetooth and USB:

    - Bluetooth USB Transport

    - USB Bluetooth transmitter

    For new functions 1 and 2, more information can be found in separate PDF file, included alongside firmware.

3. Improved USB DAC mode, reducing lag

4. Improved Bluetooth connection with car stereos

5. Added randomized background for files without album art

6. Other bug fixes