How to reverse back your Garmin unit to a previous FW version

**dasilvarsa** · 1st June 2013, 10:38 AM

[Only registered and activated users can see links. ]

Above you can find previous versions of firmware.

First backup your complete nuvi including the hidden /.system folder (Wise thing to do on a monthly basis)
Then delete gupdate.gcd inside the hidden /.system folder (this file is your 7.9 firmware file)
Download the 7.80 gcd file from the link supplied ubove (nuvi24x5and25x5_GCDFile__780.gcd)
Connect your nuvi to the computer make sure that it is set to mass storage mode.
Open the Gdc file with Webupdater and it should transfer the file to your nuvi.
After it has finished you need to disconnect nuvi from PC, Switch it on and it should flash as per a normal update.

Another method is to rename nuvi24x5and25x5_GCDFile__780.gcd to gupdate.gcd and then copy the file to the hidden /.System folder.
After Nuvi is switched On it will flash.

There is a third method which is to use updater.exe and to flash in pre-boot mode. (This is used mainly for bricked Nuvi's and is not necessary at this stage)

**fra1** · 7th July 2014, 03:41 PM

hi
just bout the astro 320 and 2xdc50 bundle.
cant seem to get the handheld to connect to the collars once i swithch the handheld on it says:
radio funtion is disabled,Frequency is not Authorised for this location.
im in the uk,northern ireland. any help would be appreciated.

thanks

**Neil** · 8th July 2014, 02:59 AM

@fra1
If you mean you're using a US 320 and DC50s in UK that would be illegal. The function was stopped in V3.60 firmware [Disabled dog tracking when used in countries for which the radio frequencies are not authorized]:

Code:

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You can downgrade to V3.40 and try that:

Code:

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but be aware that if you get caught there maybe repercussions legally:

Code:

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**svanen78** · 5th September 2014, 03:56 PM

How do you downgrade the firmwire?? I have downloaded the v3.40. from the link.

What do I do next to downgrade mu Astro 320??

**Neil** · 7th September 2014, 10:15 PM

For specific help with rolling back astro 320 please read and post in this thread if necessary: [Only registered and activated users can see links. ].

**PAVLIDIS** · 27th April 2015, 12:16 PM

still have problem with asto 320 firmware downgrade . i download the older version but even i follow the instractions it wont flashing with the old version .....please help !!!

**Ellinas** · 27th April 2015, 05:20 PM

What a lot of Greeks have done to roll back to a previous unlocked firm with Astro 320 is to downgrade with this order:

4.30>4.10>3.80>3.60>3.40

But you have to open the device after every firm flashing to complete the procedure & then start all over again.

**gmix** · 8th July 2015, 10:02 AM

So, after several trials, it's time to share my experience with rolling back the firmware.

My Nüvi is 2597, software version 7.6 and GPS firmware: 5.08.11, all updated with Garmin Express.

I wanted to do the rolling back so I could install, through Mapsource, a topo map into my nuvi, or other kind of maps.

I tried the tutorial from #catymag "How to reverse back your Garmin unit to a previous FW version", but I was not successful in any of the parts.

first, the part:

"Run WebUpdater without disconnecting the nuvi as rebooting the device will re-generate the GarminDevice.xml file restoring it's correct values. Upon checking for a new version (and finding one since you've fooled it into thinking that an earlier version is on the unit), there will be a link to an "additional info" webpage. Click on the link. "

second:

(...)connect the gps to the PC's USB port and allow it to be detected. Now drag the downloaded file to your WebUpdater icon. "

" Also did not work

Then, thirdly, I tried a different approach, from #dasilvarsa: "Another method is to rename nuvi24x5and25x5_GCDFile__780.gcd [example] to gupdate.gcd and
then copy the file to the hidden /.System folder. After Nuvi is switched On it will flash."

Mu nuvi always stayed with the same version, 7.60, no flashing.

By the way, the only link that works, to download files with previous firmwares, is

Code:

Please Login or Register to see the links

**catymag** · 8th July 2015, 10:09 AM

Have you removed old gupdate.gcd in gps as suggested?

sent with my phone

**gmix** · 8th July 2015, 03:18 PM

yes, i did.

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