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On STM32h753 UART interrupt is working fine after programming the controller using keil but malfunctions after complete power reset ?

I am working on STM32H753 microcontroller. I want to receive string using UART interrupt and send the same string back on UART. The IDE is keil uvision 5. The problem I am facing is that when I first program the MCU  UART is working fine and I am receiving back the string but after completely switching off the supply and restarting it UART is not working properly and I am not receiving the data I sent. I generated my code using stm32cube

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