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usb host bootloader

Hi all
I have problem with usb host boot loader , if the button is pressed the bootloader reads the binary code from the usb stick and writes this own at application memory from 0x8008000
after debugging it seems this is ok .

if the button is not pressed , the bootloader should jump at the application , but it does not do , it stucks in the default handler .

in the application code I set the target ROM1 start 0x800800
and I defined VECT_TAB_OFFSET to 0x800

but no way it doesnt not work . my bootloader code depends on the code of the discovery kit of
stm32f407 from ST, my MCU is stm32f407.
Could you guide me to solve it problem please ?

Regards
S. Sami

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