Brother HL-3170CDW - Manual (Page 192)

Troubleshooting
186
5
Settings Reset
5
This operation will reset all the machine's settings back to the settings that were set at the factory:
a Disconnect the network cable from the machine; otherwise the network settings (such as IP address) will
not be reset.
b Press a or b to choose Reset Menu. Press OK.
c Press a and Cancel at the same time. Press OK after Settings Reset appears.
d Press OK after Restart Printer? appears.
e The machine will restart automatically.