How do I change the language on the HL-3450CN control panel?
Press the Set button, then press the + button until SETUP is displayed and press Set again. Scroll through the available languages by pressing the + or - buttons, then press the Set button to accept the appropriate language — an asterisk mark will appear on the LCD to confirm the selection. (Page 2)
From the official Brother HL-3450CN Color Laser Printer manual, page 2
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