Here’s a general review of the based on typical industrial user feedback and technical documentation. Note that the 3RT841B is an IO-Link communication module for Siemens SIRIUS 3RT contactors, not a standalone device with user-visible firmware like a smartphone.
You're looking for information on the firmware of the 3RT841B device from 2021. The 3RT841B appears to be a model of a device made by Siemens, commonly used in industrial automation applications. Firmware is crucial for the operation of such devices, as it controls their functionality and interaction with other systems. 3rt841b firmware 2021