Q: What do I do if I forgot my passcode to turn off Guided Access?

I believe (not 100% positive, but quite certain) that you would have to handle this the same way as if you forgot a restrictions passcode.

Note: If you lose or forget a restriction passcode, you will need to perform a factory restore to remove it.

The above comes from here:

http://support.apple.com/kb/HT4213

It may be worth trying to restart the iPad (holding down the power button and home button till the apple logo shows up, then releasing them), then going into Settings to see if you can change the code for Guided Access.

I was able to do this on one iPad, so it doesn't hurt to give it a try.

If this doesn't work, you'll have to restore the iPad.

~Lyssa

Lyssa got it!

Home + Power button 4tw!!

Awesome! We tried that when a student locked up at iPad on us and got lucky

Good to hear it worked for you!

~Lyssa

This worked for me too!