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How to Fix Brother Printer Model QL-720NW with Error 1D?

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Cause of Error Code 1D:

Your printer is no longer recognized by your computer. Because a duplex unit is recognized as a USB composite device, it cannot be used. The name of this error is a 1D error.
Don't worry; just follow the instructions below if you're having issues with error 1D.

Solution for Error Code 1D:

  • Here are a few steps you should take to resolve error 1D.
  • Attempt to connect your printer to a different computer (that knows it as a printer.)
  • Give the computer a little time to identify the printer as a device.
  • As soon as your computer detects your printer, you must begin looking for your Brother Printer Model QL-720NW.
  • At this point, select the Brother Printer Model QL-720NW.
  • Select your OS family and version after selecting your model, then click the search button.
  • Choose the Firmware Update Tool from the Firmware section.
  • Currently, click the desired language.
  • A self-starting download will now be started by the Firmware Update Tool.
  • Launch the firmware updater (during this process, the wizard will automatically recognize your computer.).
  • The wizard must be followed all the way through.
  • After completing the aforementioned steps, unplug your printer from the current computer and plug it into the earlier one.
  • Your printer will now be monitored by your computer.

(Note: Use your device's network port if you don't have a computer and follow the above instructions.)

The last step in fixing a 1D error on a Brother QL-720NW printer.

If your Brother printer is still covered by a warranty, you can contact the Brother Printer Repair Center for assistance. They will also help you with any additional troubleshooting that may be necessary.