Why Is My Ipad Keyboard Not Supported. In order to do this you can go to your iPads Settings first. If you see an Accessory may not be supported alert There are several reasons why you might see this alert or similar alerts on your iPhone iPad or iPod touch.
Tap then tap Done. So first disconnect the accessory from the device and turn everything off if possible. If your Slim Combo case wont connect to your iPad using the SmartConnector check the following.
Make sure your smart keyboard is connected to iPad Pro and then launch the onscreen keyboard.
Your Lightning Cable may produce a similar error if it is not MFI certified. But it is not a problem that cant be fixed. It means that the amount of current is low enough that it may not be able to keep up with the iPads consumption. To do this just press the home button and the power button at the same time for at least 10 seconds.