I have tried holding the middle button for 10 seconds also tried it holding the top 2 buttons. Both just returned to 4 -, the LCD doesn't power off a majority of the time when I hold down the middle button which is why I am wondering if it's duff
I have a S866 LCD display and when I turn it on it wants a password, I have tried to use the default password in the manual 3745 but no joy. Can anyone help me out please? Cheers