Hi Harrison Choi ,
Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
In the application note: AN12108, it illustrates the steps of programming the boot image to external flash, in further, the NXP-MCUBootUtility is a GUI tool specially designed for NXP MCU secure boot, Its features correspond to the BootROM function in NXP MCU. Currently, it mainly supports i.MXRT series MCU chips and please go to download it, then give a try.
Have a great day,
TIC
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