full factory reset - can't get past passcode
so I am trying to give away my iPad. I don't have the passcode.
I press the power+home combo to go to recovery, then attach the USB cable and then open iTunes.
These messages keep flashing up for a split second and then go away. Sometimes I'm quick enough to press a button but in the end it always ends up with the same message:
(I'm paraphrasing here) the iPad "iPad" can't be reset right now because iTunes can't find the device
Obviously the iPad is there because iTunes knows its name. but I can't get past this point.
In putzing around with this I have seen an error -18 and an error 1668, which is a bit frustrating since if you go to this page (https://support.apple.com/en-us/HT204770) neither of these codes is listed.
I tried to go to Apple Support, but they ask for a serial number. When I type in the serial number that's on the back of the case it says it's not valid. When I click the "I can't find the serial number" link it helpfully tells me to go to settings... Which I can't do because I don't have the passcode.
Any help would be appreciated.
Thank you,
iPad, iOS 10