How to identify the printer's firmware version
You can confirm the firmware version by printing the printer settings report.
To print the printer settings report:
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Turn the printer on and make sure no paper is loaded.
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Press and hold the (Feed) button until the DATA indicator lights in red.
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Insert a piece of genuine Brother thermal paper into the printer’s paper input slot. The report will print automatically, and then the printer will return to the idle mode.
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Check the "PROGRAM VERSION" for the printer's firmware version.