Is it possible to change the preprogrammed bootloader in the system memory? We need to flash from SD card, which is not possible. This is why wee need to flash our own bootloader to system memory, but somehow I can not flash it.

[waclawek.jan]

System memory is not user-reprogrammable.

Write your own bootloader located into the first sectors of the user memory.

JW

[Tesla DeLorean]

ST's code is provided in OTP, you don't get to reprogram it. I suppose if you did $10M in business you might be accommodated.

Done SD card based loaders, can be done in 16KB of FLASH