Sounds like a challenge ;)
Let's upgrade the firmware of the router - everything should connect after that.
Follow the instructions on this link:
There are instructions to save a file to your desktop, then log into your router and click Maintenance>Router Upgrade. Complete the process - it will take a minute or two.
After the router has restarted, turn off your computer, then press and hold the reset button on the back of the Netgear with a pen or paperclip for 15 seconds, then release.
Power off the Netgear by unplugging the AC adapter - wait 60 second, then power it on. Wait one more minute, then power on your computer.
There are a couple of other modifications to these setup instructions.
Open your web browser (Internet Explorer, Firefox, Safari, etc.) and enter this address:
A login prompt will appear:
Once logged in, click Wireless Settings on the left side of the screen.
Rename the Network Name (SSID) of both the 2.4GHz network and 5GHz network to something different - anything you have not used in the past will work. This will be your new network name.
Change the Security Mode of both networks to WPA-PSK [TKIP] + WPA2-PSK [AES]. Enter a password of at least 8 characters in the Passphrase box - this will be your new wireless password.
Change the Wireless Channel of the 2.4GHz network to 11, then save the settings.
Save the settings, then try connecting to the new network name with your iPad - enter the password when prompted and you should now connect.