This erases everything on the device and installs the firmware fresh again.

1. In your preferred browser, navigate to http://www.lezyne.com/
2. At the top of the main page, there are six headers: Products, Athletes, Blog, Support, Pro Shops, and GPS Root. 
3. Hover over Support and select Update GPS Unit. 
4. You will see links to the Mac Updater and the Windows Updater for Y10 and newer devices. Click the appropriate link for your system.
   
   
5. There are a number of ways your operating system and your browser might handle the download. Make sure that the updater file is downloaded and saved to your computer. Then, run the updater.
6. Plug in your GPS device using your Lezyne micro USB cable. If you use another cable, it has to be a data micro USB cable, or it will only charge the device.
7. Go into the pull-down menu. On Windows, the firmware updater has the pull-down menu in the upper right hand corner where it says Lezyne Gps Firmware Programmer.
   
   On a Mac, the pull-down menu is next to the Apple icon in the upper right corner of your screen where it says Lezyne-Firmware-Programmer.
   
8. Select Restore device to factory defaults.
   • Note: this will erase everything from the device, including firmware, settings, and rides, and then re-install the firmware. If you don't want to lose your settings or your odometer mileage, cut and paste the Settings folder and the Totals folder from the device to your desktop. The entire Lezyne folder should not be copied back onto the GPS, to prevent file corruption.