Connect the device to a Windows Computer. Open the "BDCARD" to view files and delete all files on the SD card EXCEPT for the file labeled GTDIDF.GTG for diesel devices and GTGIDF.GTG for gas devices. Then run an update from the update agent.
If you continue to have this issue, please get in touch with us at techsupport@derivesystems.com or visit our chat option on our site, bullydog.com. Make sure you have access to a windows based pc, the device, and the vehicle when you do. Thanks.