Hi Swapnil,
Thank you for your interest in NXP Semiconductor products and the opportunity to serve you.
I'd highly recommend you to refer to the Section Kinetis flash-resident bootloader operation in the Kinetis Bootloader Demo Application User's Guide for detail and its link is below.
http://www.nxp.com/files/soft_dev_tools/doc/user_guide/KBTLDRDEMOUG.pdf?fasp=1&WT_TYPE=Users%20Guide...
Hope it helps.
Have a great day,
Ping
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