The firmware version 21 is attached.
1.) Hidden SSID and Password feature
2.) Battery indication displayed on screen
How to update firmware?
- Save the file into USB flash drive and keep the file name as it is.
- Insert the USB flash drive into the device and power it up.
- Wait till the screen shows "Update vXX to v21", press the power button one time to confirm.
- Update will run automatically for about 2 minutes and then shut off when it is finished.