Hi Guenter Loettrich ,
K32L2Bxxx already contains the ROM bootloader:

That's why the SDK didn't contains the MCUBOOT middleware.
If you want to use the related tools, eg. blhost, elftosb,etc.
You can go to the NXP mcuboot page download it:
MCU Bootloader | NXP
You can try to use the KinetisFlashTool tool to download the code.
Wish it helps you!
If you still have questions about it, please kindly let me know.
Have a great day,
Kerry
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