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Sigma-EM-016

The updated Wi-Fi module requires printer firmware version D4.2.1-SP1 or newer. Make sure that the printer firmware is updated before the installation of the Wi-Fi module with the printer.

The  the agency label should be used to identify a Wi-Fi module outside of the upgrade kit.  The updated Wi-Fi module has the WX-15 agency name. The label can be found on the backside of the physical dongle.
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