Hello Rutvij,
I'm so sorry to reply you late .
And i test it on my side , it also can not prints on terminal .
And do you want port the KBOOT , or only use it ?
For the KBOOT is so huge , in my personally opinion , it is difficult to transplant, if you want port , i recommend you refer to this :
Kinetis Bootloader to Update Multiple Devices in a Field Bus Network this is based on KL26 on CW10.6, i also have the KDS version , if you need, i can send to you . it is the same with kl25, and if you have some question about this, i can help you easily.
And if you only use the KBOOT update your code , i think you needn't check the KBOOT code .
Hope it helps
Alice