@rustybin
Most likely it's only 'soft-bricked' due to a corrupt map IMG file which cannot be loaded during the boot process. That's supported by the fact it displays "Loading Maps" message before showing a white screen and the history of the map update failing at 50%. It's essential to access preboot so you can use cure firmware. Unfortunately modern devices like your nuvi 2599 are sometimes difficult to put into preboot and often require numerous attempts. The other thing you must check is that you're using the correct firmware to make the cure. 25x9 US/EU devices can have HWID of 1758 or 1947 and they use different firmware.
There's always the possibility that it's co-incidentally suffered a hardware failure when you were updating the maps but that's quite unlikely. Keep trying to put it into preboot and load cure fw by this method:
- Make the correct cure fw RGN file for your HWID using Cure3.exe but don't try to load it to Updater.exe using the Cure3 GUI
- Locate and manually load the cure fw into Updater.exe
- Select the radio button for "USB Device" on Updater's Graphical User Interface and position the mouse cursor over the "OK" button leaving the GUI visible on the PC's desktop
- Plug a 'known-good' USB cable into a USB2 port of a PC (avoid using a hub or USB3 port)
- Ensure the nuvi is fully OFF, not just in standby - you may have to hold the power button down for anything from 10 to 30 seconds to force it off
- Hold the upper LH corner of the screen firmly with your left thumb with your fingers securely behind to support it and plug the cable into the nuvi while observing Updater's GUI
- Immediately you see the device details populated in the window adjacent to "USB Device" either click the OK button or just hit the Enter key of your PC's keyboard (you must be very fast to initiate the flash as preboot is fleeting in these devices but once data is exchanged it'll maintain preboot)
- Keep holding the device screen firmly until the flash finishes as evidenced by Updater displaying a 'success' message (or at least hold it until 'software loading' appears on the nuvi's screen).
If you load the cure successfully the nuvi should now be stuck on the Garmin logo splash screen and be seen in Mass Storage Mode by the PC so you can remove the damaged map IMG file (it'll be the one with latest date).
PS: Since when does a Frenchman refer to himself as 'an old git'? Are you an ex-pat Pom by any chance?
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