For firmware uploader, actually FRDM-KW41Z is not visible to Test tool firmware uploader. It is also not clear to use which*.srec file.
The FRDM-KW41Z is on pre-produccion phase, because of this all the information about the freedom and the KW41 is only available through the FAE or sales person, please contact your FAE or sales to get more information.
Please let me know if you do not have one.
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