In the event that the wireless network name or password is changed after a LiftMaster 821LM, 821LMB, 821LMC-S, or MyQ-G0301 is installed, new wireless information can be saved by clearing the hub's network memory and saving the new information

To update the Wi-Fi information for the hub: 

1. Clear the Wi-Fi settings on the hub by press and holding the  Settings button on the Wi-Fi Hub for roughly six seconds until the blue light flashes.
2. Power cycle the Wi-Fi Hub by disconnecting the power supply and reconnecting after 30 seconds.
3. Setup the new Wi-Fi information on the hub. For detailed instructions, see Connect the MyQ Smart Garage Hub to a Wi-Fi network.