How Do I Fix Ipad Pro Accessory Not Supported. Remove the Smart Keyboard from your iPad Pro. This accessory may not be supportedAs a iOS musician I sometime get that message and I look into how to fix it.
Firstly when you get the messages like This Accessory may not be supported or The device is not connected try to connect it again simply. Do these in this order. As we talked before most of the accessory not supported issues are caused by the cable.
Rubbing a magnet over all the connectors on both the iPad and the iPad Smart Keyboard also appears to help.
So first disconnect the accessory from the device and turn everything off if possible. If your iPad cant be unlocked you will not access your iPad. Remove the Smart Keyboard from your iPad Pro. Next tap on the General tab.