Hi Jeetesh, Yes, you can modify the firmware in the BSL area on F5xx and F6xx devices (including your F5438A). Please take a look at our MSP BSL Tools page for some reference materials. One thing to keep in mind, the BSL area is protected, but it is only 2KB. If your BSL application is bigger than 2KB, you will need to use a main-memory bootloader, and I recommend taking a look at MSP-Boot for an example of this. Your idea of reading from an SD card or external flash is fine, but will probably result in a BSL application larger than 2KB. Just something to keep in mind. Mike
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