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Reply With QuoteSo i think you're saying you've sent an image file to the 276c but it's not unlocked on the device even though you've previously unlocked the install files for MS. You need to also unlock the IMG file for the device, to do that either use JM to generate an UNL code for the 276c's UID or just google search for and use "gimgunlock.exe" on the IMG file (you won't find it here, against our forum rules to supply it).
Of course such old maps from 08/09 are about as useful as a hip-pocket in your underpants now. GPSMAP 276c can use latest Garmin NT mapping (not NTU smoothly though). It's not limited to the Old Format (non-NT) maps. Or use the open source OSM as you said, no need to unlock them and they'll work fine.
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20th December 2025, 12:36 PM #41Member +
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Hello all,
Following my collection of Garmin GPS I just acquired a 276c. Updated to 5.70
It came with City Navigator 2008 and 2009 non nt original cds.
In a windows xp sp3 32bit machine I installed them, original code and no chance of unlock.
After some hours on old posts and specially this, found the map ids, found my id, used jetmouse and used Mapsource patched and with protected garmin toolkit, all is unlocked and I see them on mapsource.
When I transfer to the 276c via usb using mapinstall (4.0.4 patched) it says on the device it can't unlockfile.
Any one from the old times that have a solution?
Keep in my I can't acess the contents of the datacard on the 276c, since I don't have the datacard reader. I can only send new map to it.
I know I can use osm and I also have been playing with it, but would love to check it how it was before, and this will serve for a garmin quest that is on the way also.
Have a great dayLast edited by skinniezinho; 20th December 2025 at 12:56 PM.
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20th December 2025, 01:03 PM #42Garmin/GPS Systems GMod.
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'Thanking Posts' are banned. To thank someone, and/or to see hidden links and content, use the [Only registered and activated users can see links. ] button below left of the helpful post then refresh your browser [F5 key]. 'Thanking Posts' are banned.
Please don't spam. Posts serving no purpose other than to thank or to ask about hidden links are trashed or deleted, it's GPSPower's policy. Please don't spam.
[Only registered and activated users can see links. ] should make their first post as a new Intro Thread in [Only registered and activated users can see links. ].
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20th December 2025, 01:34 PM #43Member +
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Thanks for your fast answer Neil. I know well gimunlock, from fiddling with Garmin Etrex, but those have the memory that can be seen.
Here I don't see the img.
Regarding newer NT, yes even 2025.10 works fine, but they look super basic (guess 276c isn't rendering correctly), like a basemap but more complete.Last edited by Boki; Today at 07:59 AM.
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20th December 2025, 01:59 PM #44Master
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You can transfer "maps" back to the PC with Mapsource along with Tracks, Waypoints and Routes.
Then you can unlock the map and transfer it back to the GPS unit.A lie goes around the internet before anyone ever fact checks it if it is true or not. In most cases no one ever checks anything they just accept it as fact.....
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20th December 2025, 11:55 PM #45Garmin/GPS Systems GMod.
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@skinniezinho
There are a few different methods to send an IMG file to a device which cannot be seen in Mass Storage Mode. The one i often used for such units as old GPSMAP and StreetPilots was utilising WebUpdater in command mode. See this thread: [Only registered and activated users can see links. ] and post there for more help if needed after reading though.
PS: Please don't quote a complete immediately preceding post, quote only relevant part/s if necessary.'Thanking Posts' are banned. To thank someone, and/or to see hidden links and content, use the [Only registered and activated users can see links. ] button below left of the helpful post then refresh your browser [F5 key]. 'Thanking Posts' are banned.
Please don't spam. Posts serving no purpose other than to thank or to ask about hidden links are trashed or deleted, it's GPSPower's policy. Please don't spam.
[Only registered and activated users can see links. ] should make their first post as a new Intro Thread in [Only registered and activated users can see links. ].
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Today, 05:05 AM #46Member +
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Hello Neil,
Sorry for the delay, missed your post. Does your method work for you in Windows 10 or it needs XP?
I recall having it test months ago in windows 10 with no sucess.
I will try back again and give you feedback
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Today, 08:00 AM #47iGO Enthusiast
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It works on win 10 without problems
User account Just needs to have all the privileges and turn off the M$ defender
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