Hi Marcus Günther,
Thank you for your updated information, and sorry for the inconvenience we bring you.
It's no problem you are using Cypress now.
But, when you have time, if you still have interest in your kinetis board, we can discuss about your problem again.
I don't know which PC OS you are using, really win10?
If yes, you need to find another debugger, eg JLINK, to download the new updated bootloader firmware to your K20 chip through J12 :
https://www.nxp.com/assets/downloads/data/en/snippets-boot-code-headers-monitors/0244_k20dx_bl_0x800...
The FRDM-K22 on board firmware is the old one, that is the known issue with win10, as you know, the FRDM-K22 board is also a little old board.
Anyway, if you have any updated information or need any help from my side, just create the question post, and let me know, I would like to help you to get out.
Have a great day,
Kerry
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