Hi customer,
Of course K series MCU supports IAP technology by using the according bootloader firmware, eg, if you use the UART bootloader, after you download the uart bootloader firmware to the MCU, then you can use the UART interface to update the application firmware.
Now, do you just want to download the bootloader firmware to K20 mcu, not the application firmware?
If yes, you should use the debugger or programmer, eg, SEGGER JLINK,P&E multilink, then use the SWD interface to download the code to your chip, you can associate with the IDE, if you just have the .hex file, you can use the JFLASH interface with JLINK.
Wish it helps you!
If you still have question, please let me know!
Have a great day,
Jingjing
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