JB4 Firmware Downloading
Tap the Firmware Update section of the settings area of JB4 Mobile.
Browse N54Tech and find the sticky'd thread for your engine type.
Find the link that will take you to the listing of firmware files.
Tap the desired hex file to start downloading. If you need help deciding which one send an email to Jon (email@example.com).
The app should automatically open a new view once the file is downloaded.
Follow the on-screen instructions.