Update Apple ID settings / Verification Failed. I can't connect to the network and Bluetooth is Unavailable following software update.

I can't connect to the network (no WiFi access even though I enter the correct password) and Bluetooth is Unavailable following software update on an iPad. Seems I'm stuck in an endless loop of trying to get onto the network so I can connect to the network and access my Apple ID so I can get my bluetooth working. Have done forced restarts. Have twice Reset Network Settings. What else can I do?