Brother MFC-9840CDW - Restoring the Network Settings to Factory Default

Control panel setup
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Restoring the network settings to factory default 6
If you wish to reset the print server back to its default factory settings (resetting all information such as the
password and IP address information), please follow these steps:
Note
This function restores all wired and wireless network settings to the factory default.
a Press Menu.
b Press a or b to choose LAN.
Press OK.
c Press a or b to choose Factory Reset.
Press OK.
d Press 1 to choose Reset.
e Press 1 to choose Yes for reboot.
f The machine will re-start. You can now reconnect the network cable and configure the network settings
to work with your network.