Hello Wang,
Do you want use the MBED mode on MAPS_KS22 board ?
If yes, please refer to the guide update the bootlaoder to MEBD:

the "k20dx128_ks22_mbed.bin" file , please see the attachment .
Pay attention, if you want use the MEBD mode , do not need copy the Jlink_openSDA .bin to
to the bootlaoader ,this is for jlink interface .
If still can not work , please take a screenshot about your steps one by one .
Hope it helps
Have a great day,
Alice
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