I am looking for a sample application and steps required to build a boot loader for NXP Frdm - KW36 board. MKW36Z512VHT4. Please help.
There it's not an exact guide for what you are looking for, still, there is a project in the KW36 SDK called fsci_bootloader and a OTA_bootloader that you might find useful to use a base.
Also, I would recommend you to check the Bluetooth Low Energy Application Developer's Guide available in the SDK documentation where you can find more details of the needed elements and considerations
You can check as well this post on how to use the FSCI bootloader.
Reprogramming a KW36 device using the FSCI bootloader
Retrieving data ...