Hi, I have a NanoPi M2 and M3 work with Android 5.1 ... I test example programs from GitHub ( https://github.com/friendlyarm/AndroidHardwareAccess ) but SerialPortDemo not working and said "Fail to open /dev/ttyAMA2!" (ttyAMA2 for UART 3) ... in Android 4.4 error not appear but it's not wo...