Thank you for your advice. I tried redownloading the IPSW file and ran into the same errors. I also used different USB cables, and had the same issues. When I originally tried to update via itunes, I kept hearing a connect/disconnect sound for the USB, I wonder if this may be cable or possibly device port related? After using three different cables, the issues still persist. I did some research online about a device storage problems for the IPad Air 2, and saw comments regarding not having enough space in 16Gb / 32Gb models. The device I have includes storage for 16GB with a SIM slot. Perhaps there's just not enough space on the IPad to accommodate the restore. The reason for why the device stopped working was because of an update from firmware version 14 to 15.
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