iOS 9 iPad not permitting Apple ID sign in
Not updatable iOS 9.3.5 early 2012, iPad3,3, A1430, MD420LL/A, with Wi-Fi and cellular... want to get into iPad to erase all data and dispose of the iPad, except after pushing the turn on button a message is there to sign into the iTunes store. After sliding to open, a popup over the home screen with a similar message to "Sign into the iTunes store" only also giving my Apple ID email address and a space to enter the password. After entering the password from the keyboard presented, another popup states, Sign in required, which disappears and the same popup with the Apple ID email address and blank password space appears. This repeats over and over. Canceling the popup only brings back the Sign in Required popup and Sign in popup again.
The Apple ID and password are valid.. to confirm I entered the iTunes account on my Mac Air. While in the iTunes account I removed the iPad as a device to purchase or download from the store. Is that the problem? Is there a way to bypass the sign in to the iTunes store requirement? Is there a means to erase / reset to factory setting without signing into the iPad?