ipad air stuck in boot loop. Need Help!

hey guys, So I replaced the digitizer on an ipad air 1st gen. after about an hour it went into a bootloop, I've tried everything from another good digitizer, and installing the original. I have tried a new battery and no change in activity. this is not the first time I've changed a digi on an ipad before, and I'm not sure what I did. I have tried wiping and reinstalling ios with itunes, and have tried to reinstall the firmware multiple times using both 3utools, and dr. fone. every time the device is prompted by one of these programs, either in dfu or recovery mode, the device goes back into the loop and gives me error 4013. I've looked at the board, and it doesn't seem to be damaged. Help Me PLEEEEEEEEZ