Thanks Butters. Unfortunately, No, I don't have any backup of either the NV or the FileSystem. All I have is the original GarminDevice.xml
Update:
Pl. Disregard. I was able to restore my device and its up & running now. The Steps used to restore the 2597 on Windows 10 Pro, are as follows:
Get the device in MSM mode first
1. Download any GCD file. I had v440 and v550 (latest) for my device (HWID 1582)
2. Used GarminCure3 to create a cure FW (RGN) file with v440
3. Applied it in pre-boot mode
4. Got MSM access
Prepare the internal FS
5. Once the device was visible to the Windows OS, used RMPrepUSB tool to reformat and prepare the device FS
6. Used RGN tool on v550 GCD to flash the original (NOT Cure) file in pre-boot mode. This restored the internal data structures minus the content
Get content from Garmin
7. Used Garmin Connect to update the Device with all pending files (maps, other files). had to do this a few times as Garmin Connect would not identify the device and crash when starting the update
Backup the NVRAM & FS
8. Made a backup of the device's NVRAM and saved it along with all the files (bins/gcd's etc) used in recovery in a separate folder just in-case
ReFlash Patched Firmware (optional)
9. Once all content and dependencies had been downloaded, used Firmware patch with original v550 GCD file to allow access to unlocked maps
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