Thread: 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:
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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:

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look also here :
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2) Turboccc RGN_Tool
here:
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3) an Hex editor
here

Code:

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4) Updater.exe
here
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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



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



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



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



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



Now load it in your unit , after having attached your device usb at your pc, in preboot mode:

Code:

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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
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