Yes, look for it in .System folder. If there's no gupdate.gcd in there look at the GarminDevice.xml in the Garmin folder because you need to establish the HWID to find the correct firmware. More info on that and other methods to check HWID are here: [Only registered and activated users can see links. ]. If you can't easily find original firmware then you can try to access MSM using QuickCure3, look at the lower part of the initial post in cure3 thread for this: "It may be worth trying QuickCure3 before using Cure3:", link is in the quote below that.