Resolved! SBSFU update with I2C instead of using Ymodem protocol
I have been able to build the STM32H7B3I_DISCO_2_Images_Loader from STM32CubeExpansion_SBSFU_V2.3.0 project targeting STM32H7B3I_DISCO board. I have also been able to build the example file and use the Ymodem protocol for sending the UserApp.sfb file...