why custom loader file work fail

[YCF.1]

I try to make a custom external loader on "STM32H750B-DK" EVM.

The custom external loader file can not work fine.

"H750_External_Boot_V2.zip" is my make external loader file project, but I do know

my custom external loader file why can not to work fine.

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After use IDE to debug the message like below.

To run code happen error ,the message like below

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