Originally Posted by NiLuJe
You probably need the empty diagnostic_logs/device_info.xml file on the root of your userstore to exit diags properly (check the latest jailbreak packages).
You might want to wait for someone else to confirm that you haven't done something horrible to your device before trying to reboot, though
Thanks for your advice. However once I put a blank device_info.xml in the diagnostic_logs folder, I get another error stating:
Mac address and manufacturing code do not match
Invalid <====== Yikes!
I tried doing some research but couldn't find any help with this problem. Thanks in advance everyone!