These models have been out of production since 2011 and are no longer supported. The final version of firmware for the Fluke 744 is available at https://www.fluke.com/en-us/support/software-downloads/fluke-744-final-release-firmware-upgrade. Firmware updates for the Fluke 744 added HART support for additional HART transmitters, but did not affect other features. We never had firmware updates for the 743B and 741B.
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