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
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
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:
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. ]
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
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?
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. ]
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?
Sorry, don't have any more idea haven't seen such a problem before. If you have a different USB cable you can try with it. This is the only thing I can think of. Maybe the problem is coming from the USB cable. Don't know. Wondering what would Garmin support says. Hope you fix it.
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