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Hello,
I have to design a device which has a STM32L152VD as main micro-controller. The user should be able to update the firmware using a GUI software from RS232. There should be a secure process to update the firmware. For example after verifying a password by micro-controller and there should be always a backup firmware to replace if the updating process failed. Should I use a second micro-controller and a flash memory to do this or is it possible to use the same MCU to handle it?