Hi Alexander Abrica Lara,
FRDM-K64 on board bootloader is the old bootloader, it is the OpenSDA v2/2.1 bootloader and have problems in the win10 system.
If you are using the win10 system, please check this link:
OpenSDA Serial and Debug Adapter | NXP
You need to use the external debugger to change the on board K20 bootloader firmware to the new version.
More details, please check this link:
Freedom OpenSDA Firmware Issues Reported on Windows 10
Please try it on your side.
If you still have questions about it, please kindly let me know.
Have a great day,
Kerry
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