for my case (STM32H745) both ICER and ICPR are defined as being an array of size 8. I experienced the same problem that EZamo.1 and KSun.3 had. https://community.st.com/s/question/0D53W00000BLufd/how-do-i-jump-from-application-code-to-bootloader-wit...

There is an error in this example. The line for (i=0;i<5;i++) should be for (i=0;i<8;i++)