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Solution: - If you encounter error 12 in your Brother printer, then definitely, some problem is going on with the duplex unit. This generally, happens when you update the newer version of your windows operating system. When you updated a new version the computer doesn’t recognize the printer as advice. Instead it displays a device with the name of USB Composite Devices. This may negatively affect the printer as you won’t be able to print anything nor you can update the Firmware of your printer.
Since, it is a serious issue; it can’t be resolve by uninstalling or installing the printer’s driver or by setting up connection again and again.
But don’t worry, as this problem is quite fixable, all you have to do is to update the Firmware of the Brother printer facing this error.
You just have to follow the following the steps mentioned below:
(Note: It will be feasible if the other computer has windows 7.)
Check whether it’s working or not by printing something on the paper. (Note: If you do not have another computer that recognizes your Brother Printer as a printer, you should fix this issue by connecting their Brother Printer to the same computer via its Network port and following the procedure described above.)