The tool is known for its simplicity, often requiring just a single "drag-and-drop" action:

Gimgunlock is a specialized utility used to remove "locked" status from Garmin map image files ( .img ), enabling them to function on compatible GPS devices without the need for additional .unl or .gma authentication files.

: Select the map file (e.g., gmapprom.img or gmap3d.img ) and drag it directly onto the gimgunlock.exe file icon.

: Copy the unlocked .img file into the "Garmin" or "Map" folder on your device's internal storage or SD card. Safety and Compatibility Considerations Garmin map management (on Mac) | - Blog - WordPress.com

: Download the gimgunlock.exe utility and place it in a dedicated folder on your computer.

: A command prompt window will briefly flash as the file is patched. Once completed, the map is ready for transfer to your device.