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  1. #11
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    I applied this patch but had some issues.
    I used RGN Tool and changed the SW version from 850 to 851.
    Saved the gupdate.gcd file in Garmin folder but nothing happened on the device.
    I found a file with the same name in .System folder, renamed it and put my patched file in there.
    Turned on the device and after a while it informed me that 8.50 (not 8.51) has been installed but the warning screen was still there.

    1. Could you tell me what's the alternate method with pre boot mode? Should I change the software version on both methods and will be informed from Garmin WebUpdater when 8.51 comes out?
    2. How could I restore the original firmware if something goes wrong from a modified firmware?
    3. What settings did you use in IDA Pro? If I knew how to disassemble properly I could understand better what changes should be applied

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  3. #12
    Garmin/GPS Systems GMod.

    Neil's Avatar
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    @ioannis0
    Older Garmin devices update using gupdate.gcd in internal Garmin folder, new devices like your 2599 use the [hidden] .System folder. Renamed file [851] is still v8.50, the renaming is only to 'fool' the device into loading it via GCD. The modded V8.51 file can also be loaded by dragging it onto WebUpdater.exe or it's shortcut icon on your desktop, or using a Garmin root folder in microSD card [remove any existing GCD from .System first].

    Using the fw file as an RGN via Updater.exe in preboot does not require a change in SW Version in RGN_Tool but you must ensure you use the fail-save naming convention: <hwid>01000<swv>.rgn and for your purpose that's 194701000850.rgn [again, remove any existing GCD first]. Any naming of RGN other than fail-safe '01000' will force the flash so be sure to check everything very carefully.

    Clearly the patch hasn't worked if you're still getting the warning screen. You can restore original firmware by same methods using changed version GCD or by flashing in preboot with RGN.
    'Thanking Posts' are banned. To thank someone, and/or to see hidden links and content, use the [Only registered and activated users can see links. ] button below left of the helpful post then refresh your browser [F5 key]. 'Thanking Posts' are banned.
    Please don't spam. Posts serving no purpose other than to thank or to ask about hidden links are trashed or deleted, it's GPSPower's policy. Please don't spam.
    [Only registered and activated users can see links. ] should make their first post as a new Intro Thread in [Only registered and activated users can see links. ].

  4. #13
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    First off, you will want to be using kunix's garmin loader from [Only registered and activated users can see links. ]

    After IDA finishes auto analysis you can start making it more readable by correcting misidentified strings and pointers and code.

    Downloading version 2.16 Street Pilot for Android and dissassembling it's libgarminos.so can also be helpful since it did not have symbols stripped.

    Here is a partly working idc script to get you started with the array of strings:
    Code:
    Please Login or Register to see the links

  5. #14
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    This will not eliminate the warning but will help finding the patch that will by verifying that sub_20754CFE is being called in the process of showing the warning screen. At file offset 0x6D4D94 patch from A7 6E CF AB to 26 C8 F3 2B. This should change the text of the warning to "Vehicles are not allowed on the road ahead. Take the closest exit to an alternative road."

  6. #15
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    I tried the patch but I didn't see any change.

 

 
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