Hello Pedro Correa de Castro,
Just as what I have replied you in your another post:
If you want to update the firmware without using the kinetis flashtool, just with other embedded, you need to write the code by yourself. we still don't have it.
But i think you still can refer to the kinetis flash tool code, which you can find the source code in folder:
NXP_Kinetis_Bootloader_2_0_0\apps\KinetisFlashTool\KinetisFlashTool
Wish it helps you!
Have a great day,
Kerry
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