Resetting any device will the wipe all data out from the device. In case of WiFi extenders, you can backup your data and the reset the device. But you should try other troubleshooting tips to resolve the problems. If all the solutions fail, then the last solutions are RESET. First, you should know why you might need to reset the RangeXTD WiFi range extender and then learn how to so it. https://medium.com/@marteric098/how-to-reset-your-rangextd-wifi-extender-properly-4ec0363f98f4