program MCU via system rom bootloader and CANBUS STM32F2

hello :)

I am trying to program my MCU via system ROM bootloader.

I have read an3154-can-protocol-used-in-the-stm32-bootloader-stmicroelectronics reference manual &

an2606-stm32-microcontroller-system-memory-boot-mode-stmicroelectronics.

I wrote a C++ program as a host, I can read and erase pages from memory, but I cannot write to the flash.

I have success only write a page of 256 bytes to the base address of each sector, if i try to write to other locations it fails.

i added a pictures of a sector that i tried to write to. as the manual says i am writing 256 bytes every time.

as you can see only the first 256 bytes succeeded. any ideas?

thanks, Eliran.

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