Wanna Update your Garmin GPS175/GNC355/GNX375 Main software v. 3.30 ?

PhilzSkyHdx

Member
Joined
Oct 11, 2025
Messages
35
re: Garmin Main software 3.30 update

I spent over an hour trying to find out how and where to get the download file on the Garmin websites to do this update on my Garmin GPS175 nav. Garmin must enjoy making it difficult to do this? Here's what I did to generate the SD card install file:
(SB install instruction .pdf attached)

(2026) Service Bulletin 26085 Rev A: GPS 175/GNX™ 375/GNC® 355 Main Software Version 3.30 and GNX 375 Transponder Software Version 2.90
Link: (SB General Description)

Where to get the install file: (link below)
The following content is available for registered users:
Manuals
Software
Service & Installation Bulletins
Service Communiques & Letters


Doc ID: SB26089 RevA (Service Bulletin, Install Instructions)

*Experimental* GPS175/GNC355/GNX375 TSO Software - Main v3.30

then
Downloaded and Installed below file on my Windows PC to generate the install file on a Mini-SD card, then load into your Garmin GPS175/GNC355/GNX375
(remember 32GB max SD card)

(download this file)
GPS 175/GNX™ 375/GNC® 355 TSO Software - Main v3.30, Transponder v2.90 006_b3353_0e_a.zip
(unzip this to generate the actual install files)

ENJOY!
 

Attachments

  • SB 26089a Install Inst.pdf
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