Garmin G3X Installation Manual page 83

3. The unit will reboot, then GDU software update will begin automatically.
4. Ensure power is not removed while the update is being performed.
5. The unit will reboot after the update is complete,
6. Repeat for each GDU in the aircraft, then proceed to Section 7.2.2.
7.2.2 GSU Software Loading Procedure
The GSU software is loaded through the GDU. Use the following instructions to load GSU software if
needed.
1. After doing the steps in Section 7.2.1, the GDU can now identify the software version
currently in use for the GSU and compare it to a GSU software update that has been loaded to
internal GDU memory. If the current GSU software is different than the GSU software
stored in GDU memory, a "GSU 73 Software Update Required"message will be displayed on
the MESSAGES page. The MESSAGES page is accessed by pressing the MESSAGES
softkey on the INFO page in normal mode.
2. Turn the GDU off, and then back on in configuration mode (Section 7.3). A UPDATE SW
softkey (in white lettering) is shown on the GSU page in configuration mode when an update
is available. The UPDATE SW softkey appears subdued or gray when no update is available.
Press the UPDATE SW softkey to initialize a GSU software update.
3. After pressing the UPDATE SW softkey a confirmation will be requested. Press the ENT
Key to begin updating the GSU software.
G3X Installation Manual – Software, Configuration, Databases, and XM Activation
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Revision E