To update the firmware using a Windows or MAC computer, you must first run a program to import the latest firmware files from our site. To do this, please open the NK LiNK software. Click on the Help tab at the top of the screen. Click on the link found under Step 1 of the instructions and run this program. Link will be an .exe file for Windows users and a ZIP file for OS X users. For Windows run the .exe program. The next time you connect your SpeedCoach, you should be prompted to update your firmware. Just click Yes to update. For MAC users, follow the directions in the zip file. If you do not get automatically prompted, you can go to the Manage tab and select Update Firmware. If you are not prompted again, you most likely have the latest firmware available. Alternatively you can connect to the LiNK Logbook mobile application. Go to the More Tab and select Frimware update. Make sure SpeedCoach is in Data LiNK Mode. Note: All data sessions will be deleted from the unit after updating the firmware. The heart rate belt will also need to be re-paired.