Brother HL-2170W - Manual (Page 45)

Wireless configuration for Windows ® using the Brother installer application (For HL-2170W)
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f Choose Step by Step install (Recommended) and then click Next.
g
Choose Without cable (Advanced) and then click Next.
h Read the Important Notice to enable the wireless interface. Hold down the Go button for 10 seconds,
and then release the Go button when the printer prints a Network Configuration page.
Check the box after you confirm the wireless setting is enabled, and then click Next.