Updating firmware on a Garmin G3X glass cockpit is a straightforward process performed by the user, but it must be done carefully to prevent system issues. The firmware is loaded onto a formatted SD card and then transferred to the G3X display. The primary display then automatically updates all connected components on the CAN bus.
The Firmware Update Process
- Preparation 💾: You will need a blank SD card (no larger than 8 GB is recommended). Download the latest G3X operating software from the Garmin website.
- Creating the Update Card 💻: Insert the SD card into your computer. Run the downloaded installer file, which will prompt you to specify the drive letter of the SD card. The installer will then copy the necessary files to the card, creating a “Garmin” folder at the top level (root directory).
- Loading the Update ✅: Apply power to your G3X system. Insert the SD card containing the software update into the display’s SD card slot. The system will prompt you to confirm the update. During this process, the display will show a “Loading” message. Do not remove power during this time, as it can corrupt the system.
- System-Wide Update 🔄: Once the primary PFD (Primary Flight Display) is updated, it will automatically push the software update to all other connected components on the CAN bus, such as the GSU 25 AHRS, GSA 28 autopilot servos, and other LRUs (Line Replaceable Units). Ensure all these units are powered on during the update.
- Verification 📜: After the update is complete, the display will reset. A final check in the configuration mode will confirm that all components have been updated to the correct software version.
Troubleshooting Common Update Issues
- Failed Update: If an update fails, it may be due to a corrupted file or an issue with the SD card. Try reformatting the card and re-downloading the software.
- Stuck on a Specific LRU: If the update gets stuck on a specific LRU, there may be a communication issue on the CAN bus. To fix this, you can try isolating the units. Pull the breakers for all units on the bus except for the primary display and the unit that failed to update. This allows the update to transfer without interference.