GPSrChive Discussion Forum

I have such a problem, in the navigator on the information tab it says that the firmware version is 9.60, when connecting the navigator to Garmin Express it shows that the firmware is 11.60 and no updates are required. I contacted Garmin technical support, but they did not advise anything except to reset the device to factory settings and still after these operations the problem remained (((.

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I had the same issue once on my GPSMAP 67, where the version numbers did not match after an update.

The solution as advised by Garmin was to copy the firmware update file to the Garmin folder of the internal storage of the device, and create an empty file called FORCE.TMP in the same folder. Then reboot the device.

This will force an install of the update file (GUPDATE.GCD), independent of the actual version of the update file (yes it can also be used to downgrade a device).

Not 100% sure if this procedure will work on a 66s, but worth a try.

Only issue is where to get the correct 11.60 firmware update file. I’m afraid I can’t help with that, but maybe someone else can.

And of course this procedure is at your own risk.

Thanks for the advice, I did everything as you said (I found the firmware for the device 10.70) but after rebooting nothing happens, the navigator works and does not update.

JungleJim wrote: Thu Aug 28, 2025 4:57 pm This will force an install of the update file (GUPDATE.GCD), independent of the actual version of the update file (yes it can also be used to downgrade a device).

I've updated the device to a newer version multiple times, older versionm, updated didn't require an additional file.

The problem is with updating to the version installed on the device ( to the same version).

The device had the same software version and the update file was the same version, so the service recommended an additional file to update it again.

In GPSmap 67, there's no update via a file with the .GCD extension; it's replaced by a file with the .GSP extension. The file name has been preserved.

speedser wrote: Thu Aug 28, 2025 1:55 pm I have such a problem, in the navigator on the information tab it says that the firmware version is 9.60, when connecting the navigator to Garmin Express it shows that the firmware is 11.60 and no updates are required.

I understand that it is irritating, but I wouldn't worry about it, there will be a new update and maybe it will go back to normal.

Please try next the RGN firmware install found at GPSrChive > GPSMAP 66 > Firmware

Przekątny wrote: Thu Aug 28, 2025 10:49 pm

speedser wrote: Thu Aug 28, 2025 1:55 pm I have such a problem, in the navigator on the information tab it says that the firmware version is 9.60, when connecting the navigator to Garmin Express it shows that the firmware is 11.60 and no updates are required.

I understand that it is irritating, but I wouldn't worry about it, there will be a new update and maybe it will go back to normal.

The thing is that the expedition mode on this firmware version 9.6 does not work properly. and I cannot update the firmware using standard features

GPSrChive wrote: Fri Aug 29, 2025 2:44 am Please try next the RGN firmware install found at GPSrChive > GPSMAP 66 > Firmware

Thanks for the help, I did everything according to the instructions, but I have some questions, is that okay?
Firmware file 10.70


Verify the HWID displayed in the RGN_Tool window matches your GPSr HWID
GPSMAP 66s, 66st HWID = 3028

speedser wrote: Thu Aug 28, 2025 5:51 pm Thanks for the advice, I did everything as you said (I found the firmware for the device 10.70) but after rebooting nothing happens, the navigator works and does not update.

Ah that’s too bad, apparently the procedure does not work on the 66s. Was worth a try!

speedser wrote: Fri Aug 29, 2025 5:20 am
Thanks for the help, I did everything according to the instructions, but I have some questions, is that okay?
Firmware file 10.70

Verify the HWID displayed in the RGN_Tool window matches your GPSr HWID
GPSMAP 66s, 66st HWID = 3028

Interesting, we see that too.

If this procedure fails you, save all important data from the device, then install an older version, like 7.20 or 7.60, which will reset the device completely and clear all user data. Once the older firmware is verified, Garmin Express should offer you the most current version, or you can manually install it yourself.