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  1. #21
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    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.
    [Only registered and activated users can see links. ]

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  3. #22
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    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:
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  4. #23
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    Have you removed old gupdate.gcd in gps as suggested?

    sent with my phone
    [Only registered and activated users can see links. ]
    [Only registered and activated users can see links. ]

    [Only registered and activated users can see links. ]
    You have to navigate to get to the good.
    Nuvi1250/Nuvi 34xx/Nuvi 2200/Nuvi 66/Oregon 600/Galaxy S5 MM 6.0.1/TomTom GO/iGO Nextgen Avic,Basar,Isr.Gift/Navigon
    Please don't flood my pm box with questions you can post on forum!! You won't hear back from me.

  5. #24
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    yes, i did.

  6. #25
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    Attach nuvi usb, modify the sw version in garmindevice.xml to a previous version, in your case, for example 7.30 if you want to flash 7.50, don't remove nuvi from USB, put the *.gcd you want to flash on desktop along the Webupdater icon shortcut (they must be both on desktop), drag&drop the *.gcd in Webupdater and flash
    [Only registered and activated users can see links. ]
    [Only registered and activated users can see links. ]

    [Only registered and activated users can see links. ]
    You have to navigate to get to the good.
    Nuvi1250/Nuvi 34xx/Nuvi 2200/Nuvi 66/Oregon 600/Galaxy S5 MM 6.0.1/TomTom GO/iGO Nextgen Avic,Basar,Isr.Gift/Navigon
    Please don't flood my pm box with questions you can post on forum!! You won't hear back from me.

  7. #26
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    Quote Originally Posted by catymag View Post
    Attach nuvi usb, modify the sw version in garmindevice.xml to a previous version, in your case, for example 7.30 if you want to flash 7.50, don't remove nuvi from USB, put the *.gcd you want to flash on desktop along the Webupdater icon shortcut (they must be both on desktop), drag&drop the *.gcd in Webupdater and flash
    Thanks for your reply.

    It seems having both the firmware file and the Garmin Express Updater on desktop is essencial, I hadn't understood that from the instructions.

    I edited the .xml file to 3.70, to update to 4.00. I had to turn off the internet so in Tools (in Garmin Express) finally the version appeared 3.70.

    But, there were no different options, like "additional info". Nevertheles, I followed the instructions, ejected the nuvi, turned it on, but the version is still 7.60.

    I tried with three different files from [Only registered and activated users can see links. ] 2.70 (nuvi2xx7_GCDFile__270.gcd), 4.00 (nuvi2xx7and2xx8_GCDFile__400.gcd) and 4.60 (nuvi2xx7and2xx8_GCDFile__460.gcd), no good luck with either of them.

    Any suggestions?
    Last edited by gmix; 8th July 2015 at 18:05.

  8. #27
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    If you read carefully I wrote Garmin Webupdater and not Express, read my instructions again please.
    Code:
    Please Login or Register to see the links
    Please code non sharing host sites external links to avoid refback . Thanks
    You posted [Only registered and activated users can see links. ] and you got my reply and I uploaded a firmware file for you.
    [Only registered and activated users can see links. ]
    [Only registered and activated users can see links. ]

    [Only registered and activated users can see links. ]
    You have to navigate to get to the good.
    Nuvi1250/Nuvi 34xx/Nuvi 2200/Nuvi 66/Oregon 600/Galaxy S5 MM 6.0.1/TomTom GO/iGO Nextgen Avic,Basar,Isr.Gift/Navigon
    Please don't flood my pm box with questions you can post on forum!! You won't hear back from me.

  9. #28
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    Thank you very much for your patience, #catymag, with webupdater it worked out easily, but...

    Only with the file you sent me in that link (nuvi2xx7and2xx8_530.gcd - HWID 2077).

    All the other files from Perry, from 4.70 and 4.60 back to nuvi2xx7_GCDFile__270.gcd, did not work... And the version 5.30 still does not allow for the installation of other maps in my nüvi 2597. From my investigation, I really need minimum version 4.60, but the one I got from Perry does not work.


    So, could you check if there's, perhaps in the archives, other option for version 4.60 HWID 2077?

  10. #29
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    Sorry I don't have it, I hope other member will help you.
    Good luck!

    sent with my phone
    [Only registered and activated users can see links. ]
    [Only registered and activated users can see links. ]

    [Only registered and activated users can see links. ]
    You have to navigate to get to the good.
    Nuvi1250/Nuvi 34xx/Nuvi 2200/Nuvi 66/Oregon 600/Galaxy S5 MM 6.0.1/TomTom GO/iGO Nextgen Avic,Basar,Isr.Gift/Navigon
    Please don't flood my pm box with questions you can post on forum!! You won't hear back from me.

  11. #30
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    Thanks to #Giomen in [Only registered and activated users can see links. ],

    and to his file for HWID 2077, version 4.60

    [Only registered and activated users can see links. ]

    I have finally managed to roll back the firmware of my nuvi 2597 to 4.60.

    But... Unfortunately my device (Nuvi 2597) really does not allow for other maps than the one from Lifetime update, through Garmin Express...

    I've fished out more info:

    from #catymag' post, on 9th February 2015, 02:02 PM:

    Unfortunately as stated in OP quote

    New gimgunlock-0.03+MapSigPatch
    unlocks NT (not NTU) IMGs in newer devices, but not working with all new devices 2xx9
    If you have 2xx7 (8) (PartNumber> 006-B1582-00), works

    If you have 2xx7 (8) (PartNumber> 006-B2077-00), doesn't work. [THAT'S MY CASE]

    Your device have a new protection in firmware.

    And also from #Cents:

    I am a new member and a complete Newb at updating maps in a GPS. I just bought a Garmin Nuvi 2597 from Costco Canada a week and 1/2 ago. Right after I got it I used Garmin Express to updated the maps and a software update (I think a firmware update but not completely sure). I have read a large part of this thread and others and have checked the Garmin XML file and it has the dreaded "PartNumber> 006-B2077-00" near the beginning of the file. Is the part number tied to the physical device and so is unchangeable and I am simply done until someone finds another way around this with a new gimgunlock or similar, or is the part number tied to a firmware update that I might have done, and if I roll back the firmware based on info in this forum and use the latest gimgunlock I could then install a Garmin European NT map?

    Answer by #catymag: @Cents.
    Sorry actually you cannot unlock maps with unlockers in your device.

    So, I thank a lot for the help - it's a great forum - and I'll be waiting till some genius can figure out a way to remove this protection from Nuvis 2597 (and the others) with part-number "HWID 2077"

    Cheers!

 

 
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