Hi Amit,
The OpenSDA interface in the FRDM-K20D50M board only support to program the K20, it will fail to program the other MCU.
However FSL already provided another version of the OpenSDA, I think it could meet your needs.
Please get the more detail information about the OpenSDA interface through the link as follow.
OpenSDAv2
Have a great day,
Ping
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------