How to identify the printer's firmware version
To learn how to find out what version of firmware you have, please follow the instructions below:
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Make sure that the printer is turned on and that no paper is loaded.
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Press and hold the Feed button for two or more seconds until the DATA indicator turns 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 an idle state.
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When the list of printer settings is printed, check the following item under "Current Settings".
"PROGRAM VERSION : PJ-Main VX.XX"