I have a friend who gave me their iPad to fix because they don't have a computer. It has the iTunes icon with the charger cord on the screen and that is all that will come up. When I plug it into my computer it shows that it is in recovery mode and when i hit restore iPad it says "extracting software" then "preparing iPad for restore" then "waiting for iPad". After that an error message comes up and says error 21. I am unsure of the last OS he had on the iPad.
I did some research on error 21 and the web says its the result of jailbreak, so i asked my friend and he had no idea what that even was so i totally believe him. I have tried everything i could find on the web to fix the error but have had no success. so far i have tried the following.
1. do restore with iTunes icon and charger plug on the screen pushing no buttons.
2. do restore while holding the sleep/wake and home button, then just the home button during restore.
3. downloaded tiny umbrella but i couldn't run the software on my computer. the program would start and the icon would bounce in the dock then disappear.