There are three ways you can attempt to restart or reset your Garmin forerunner 230 or 235. Bare in mind that these operations may or may not delete your activity history. That's why it's a good idea to sync after each activity. If your forerunner is frozen, do the following: 1. Press and hold the power button for at least 15 seconds or until the unit restarts If you want to reset the user settings, do the following: 1. With the device off, turn it on by pressing BOTH POWER/BACKLIGHT and LAPS/BACK Button. 2. Hold buttons until you see the CLEAR USER DATA screen. If you want to wipe the forerunner clean, do the following: 1. With the device turned on, navigate to your MENU | SETTINGS | SYSTEM | RESTORE DEFAULTS 🛰️Latest Garmin Products 🛰️ https://www.amazon.com/shop/jimcyr?listId=52EHR3AC16B1&ref=idea_share_inf 🛒 Accessories For Your Garmin 🛒 https://www.amazon.com/shop/jimcyr?listId=37RPHCBURZAK&ref=idea_share_inf 🚴 #FatBike and #BikePacking Gear 🚴 https://www.amazon.com/shop/jimcyr?listId=UG4NRUB72P67&ref=idea_share_inf 🚛 #Truckcamping Gear List 🚛 https://www.amazon.com/shop/jimcyr?listId=4O4Y9NWK0AKA&ref=idea_share_inf 🛒AMAZON IDEA LISTS🛒 https://www.amazon.com/shop/jimcyr #avoidingchores #garmin