Hi Ken Su ,
If you are using RT1015, please refer to this blog:
https://www.cnblogs.com/henjay724/p/9098577.html

In fact, if you download the SDK doc, and the middleware also select the mcuboot, you can find it in the sdk doc document: blhost user's guide.pdf

Wish it helps you!
If you still have questions about it, please kindly let me know.
Kerry
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