Legend:
MAP: Yes - it verifies the presence of a valid unlock code, to unlock an .img you can simply use JetMouse keygen.
GMA: Yes - it verifies the FID limit (2200) and the presence of a valid *.gma,
to unlock an .img you enough to use the old gimgunlock-0.03 (without MapSigPatch) or one of its derivative.
MSV: Weak - it verifies the validity of map signatures in a simple way,
you can unlock an .img using http://www.gpspower.net/software ... nlock-v-0-04-a.html (without patching your firmware),
but in case of unicode maps (CP 65001) you must modify the CP value.
More info here: Temporary authentication of Unicode maps (codepage 65001)
MSV: Strong - it verifies the validity of map signatures more complicated way,
in this case you need to patch your firmware and unlock an .img using any correct unlocker.
GVS: Yes - it verifies the validity of firmware signatures,
to install the patched firmware for the first time you have to use Updater.exe.
See below if your device has "GSV: ---" because you can skip Steps 6-8 as you don't need to load using an RGN file [but you can if you want to that way]. You can flash even initially with a patched GCD file higher version number as explained.. If your device has "GSV: Yes" then you must initially flash it with an RGN file using Updater.exe so continue on with Steps 6-8. Regardless of method used do Step 9 to finish.
Originally Posted by Neil You can even flash initially via patched GCD file if your unit has no GSV in firmware. If you accidentally load a new version of original [unpatched] firmware and your device has "GSV: Yes" then you'll need to revert to the RGN method.
Warning for Montana 680 users:.gif)
Thanks to this forum and its members who inspired me 
If you fail, before posting, read "troubleshooting" in post #2First of all, probably you havent read carefully starting post ;)
Use/download the patcher posted by big-bang in this thread only,
it's not granted files posted in other forums are updated and work fine.
It may fail if: No Garmin USB drivers installed in your pc.
It may fail if: No existing gupdated.gcd removal from device or sd before flashing patched.rgn/gcd
It may fail if: No flash occurs [Patched GCD is ignored by device] Increase version number during patching process see post #562
It may fail if: No hard reset or clear nonvol performed before&after flashing by Updater.exe or sd
Failure using Updater.exe:
You fail when Updater.exe is not opened in desktop when you plug gps into UBS port in pc: device
stays in preboot for a VERY short time, some units only for ~10 seconds. So if it doesn't receive a flash in that time
it goes to the white calibration screen and you have to go thru that and start again.
How to: put your nuvi into preboot by holding the top LH corner of its screen and connecting to a REAR USB port of PC.
Immediately press 'OK' or hit enter key when you see the nuvi's detail in the window to the right of 'USB Device' and
keep pressure on the screen until the flash finishes or at least until 'Loader'/'Software Loading' shows on the screen.
You fail when: Patched firmware.rgn is not in the same directory along Updater.exe when dragged&dropped into Updater icon.
Not continued pressing the top left corner on the screen until the update is complete.
Not suitable USB cable, try another one, even Garmin cable might fail (Error IOU_UTILITIES.CPP etc.).
Wrong HWID firmware, check your garmindevice.xml in Garmin folder.
No patched firmware.gcd renaming to the correct form as suggested in post:
n 253
Failure using Webupdater:
You fail when Webupdater is not on desktop when dragging&dropping the patched.gcd into its icon.
In Montana 680 not disabled geocache dashboard in map settings before using map as per warning in this thread.
Note: Updater.exe works fine in Win 10/8 x64.
Note2: JNX patcher works fine with patched firmware.
Note4:No problem to update maps with Express after patching firmware.
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