Hi Roy,
Please download the KBOOT2.0 at first, this bootloader have the UART bootloader for K64, you can find the bootloader code in folder:
NXP_Kinetis_Bootloader_2_0_0\NXP_Kinetis_Bootloader_2_0_0\targets\MK64F12
More details, please read the document in folder:NXP_Kinetis_Bootloader_2_0_0\doc
Wish it helps you!
Have a great day,
Kerry
-----------------------------------------------------------------------------------------------------------------------
Note: If this post answers your question, please click the Correct Answer button. Thank you!
-----------------------------------------------------------------------------------------------------------------------