Dell 2355dn Multifunction Mono Laser Printer - Manual (Page 76)

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Firmware Update Utility
You can update your printer’s firmware using the Firmware Update Utility.
1 From the Start menu, select Programs Dell Printers Dell 2355dn Laser MFP
Firmware Update Utility.
2 Download the latest firmware. Click http://support.dell.com .
3 If your printer is connected with an USB cable, click USB Connected Printer.
Or if your printer is connected with a network cable, click Network Connected Printer.