Hello Guilaume,
Please download the latest AN2295 : Search Results: an2295 ,
then you will find in the bootloader.c file , the default setting is

so , please change on the "AN2295_TWR_K60_cfg.h " file .
Change
#define KINETIS_MODEL K60_100MHz
to
#define KINETIS_MODEL K60_120MHz
Have a great day,
Alice
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