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  1. #1
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    pin How to make a service (cure) firmware for your Garmin unit

    How to make a service (cure) firmware for your Garmin unit


    As said here:
    [Only registered and activated users can see links. ]
    you can get a software missing message ,after a firmware update, or if your unit boots and reboots after loading a map ,a track ,a poi or something similar, you'll need a service software to cure your Garmin gps and see it booting normally again.

    To create and load it ,you will need 4 things:

    1)Your unit firmware (use a previous one not the one you have on your unit)
    You can get it directly on Garmin server (now many have been deleted) , on Perry site
    Code:
    Please Login or Register to see the links
    look also here :
    [Only registered and activated users can see links. ]

    2) Turboccc RGN_Tool
    here:
    [Only registered and activated users can see links. ]
    3) an Hex editor
    here
    Code:
    Please Login or Register to see the links
    4) Updater.exe
    here
    [Only registered and activated users can see links. ]

    First open RGN_Tool and drag in it your downloaded GUPDATE.GCD.
    In my case is FW 2.50 for 3790.

    Now save the file in the following way (example for 3790-firmware 2.50):
    The first four digits must be 1101 (the hardware ID) followed by 01000 , followed by the firmware number 250.
    It will be :110101000250.rgn : 3790 original 2.50 FW.rgn
    Yours will be xxxx01000xxx.rgn

    3O0CM

    Now open HxD and drag the .rgn file in it.
    We have to change some values related to some extensions (.img .GCD .gpx .gpi .zip .vpm)
    Why ? Coz one of these files prevents our nuvi to boot normally , changing the extension the firmware wont find the corrupted one anymore and will boot.
    So let's change them.
    click on Search and then Find and fill the opened window like that

    bj55T

    Then click ok.

    the editor will find the .img extension, let's change them all.
    Select the i and replace it with x and clicking F3 find and change all the .img extensions to .xmg

    Hqz9w

    We'll do the same with all the .GCD .gpx .gpi .zip .vpm extensions

    H2TKz

    Must be sure to change them all!

    Now save the new cure file as 110101000250_cure.rgn (example for 3790 fw 2.50). Yours will be xxxx01000xxx_cure.rgn

    GZiDF

    Now load it in your unit , after having attached your device usb at your pc, in preboot mode:
    Code:
    Please Login or Register to see the links
    tick USB mode ,drag&drop the .rgn in updater icon, flash your gps.

    After flashing it , your device should boot and you can delete the corrupt files who caused the problem.
    Reflash now it again with the original.rgn and then you ll be able to update your device to the latest firmware using webupdater.

    Edit : or now use this great tool by Kunix
    [Only registered and activated users can see links. ]
    [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.

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  3. #2
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    Nice. But not always helpful. Sometimes there could be bad sectors in the memory or sometimes nuvi just not want to boot even if you change extension of the files gpi, gpx, img, vpm, jpg, srd,srx, asr, srf, gcd etc. IMHO the best way is changing the drive letters everywhere in the memory. Here how to make it in Hex:

    Find and Replace everywhere in the .rgn (boot+fw_main):
    30 00 3A 00 2F to 00 00 3A 00 2F
    31 00 3A 00 2F to 00 00 3A 00 2F
    30 3A 2F to 00 3A 2F
    31 3A 2F to 00 3A 2F

    Here is such an example:
    Code:
    Please Login or Register to see the links
    I have wrote it here also:
    [Only registered and activated users can see links. ]

    Hope it is helpful.

    Cheers,
    Last edited by ddabcd277; 31st March 2011 at 07:04.

  4. #3
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    Thank you so much for this good knowledge. This is really helpful.

  5. #4
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    If the problem is from the Keyboard. Can we just change the .kbd into .xbd without changing other file extension?
    Last edited by Tzidogang; 1st April 2011 at 16:24.

  6. #5
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    Thank you very much for this instruction. Today, the reformed its 3790.

  7. #6
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    It works for my 3760t. thx a lot!

    Greetings from Argentina

  8. #7
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    During map update process map update tool hangs, and after kill process from task manager restarted Nuvi 3790 goes into loop "Loading Maps" After long game with cure firmware i found, that if i change 30 00 3A 00 2F to 00 00 3A 00 2F device enters in to PC connection mode. Unfortunately, computer doesn't recognize it as Mass Storage device Anyone, any suggestions what i need to do now?

  9. #8
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    @ VMatas

    Didn't quite understand the comment. If your nuvi has entered in PC connection mode (you can see the PC icon on the screen) then it should be recognized as a Mass Storage Device. Try reinstalling the Garmin USB drivers:
    [Only registered and activated users can see links. ]

    Here is a cure firmware 4.10 I prepare for 37xx series. Hope it is helpful:
    [Only registered and activated users can see links. ]

    Normal FW 4.10:
    [Only registered and activated users can see links. ]

  10. #9
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    Yep, i also not understand why my PC and laptop can't see nuvi... strange. Anyway thanks, i will try your suggestions.

  11. #10
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    No way.. drivers updated. Windows XP and Vista doesn't see it, MAC OS X too, using my cure firmware and yours - no changes.. Nuvi shows PC connection icon, but it can't be recognized. Don't have any idea why. May i need contact Garmin support on Monday?

 

 
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