Perform a hard master reset of the device using the physical button combination specific to your Garmin model (usually holding the bottom right corner of the screen during a normal boot sequence).
Your watch is now clean, but it is running a disabled "CURE" operating system that cannot track workouts or load GPS maps. You must restore it to factory settings. Go back to the application on your computer. Load the same original GUPDATE.GCD file. Change the setting configuration from CURE to ORIGINAL . Click Make Firmware . garmin cure 3 download
: Once the device is recognized as a disk, remove corrupt files or use tools like RMPrepUSB to reformat the internal storage to FAT32 if necessary. Perform a hard master reset of the device
If your Garmin device is still under warranty, it is highly recommended to contact Garmin support first. If not, the is an excellent community-driven option to fix persistent boot issues. the new way to create cure firmwares for Garmin devices Go back to the application on your computer
Disclaimer: This tool is used at your own risk. It is intended for advanced users trying to recover a completely unresponsive device.
Click the browse button ( ... ) next to the "Original Firmware" path and select your downloaded .gcd file. Step 2: Generate and Flash the "Cure" Firmware
Before downloading anything, connect your Garmin to a PC via USB. Navigate to the Garmin drive (e.g., G:). Copy the entire Garmin folder to your desktop. This preserves your original maps and GPX data.