SR25 v1.60

[Warning]

Before firmware upgrade:

1. Make sure of the battery level at least over 50%.

2. Make sure of the memory size at least over 500MB.

3. User setting is initialized after upgrade.

4. Before upgrading, please make a backup of important files just in case.

[How to upgrade]

1. Connect to Wi-Fi

2. Find 'new' firmware on Setting - Update - System update

[Improvements]

- AK File Drop function added

- BT Sink function added

- System stability improvements