how to dump the existing hex files into stm32 MCU and how

[Mm.3]

..

[Jack Peacock_2]

Use bootloader or JTAG/SWD port

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[AvaTar]

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[Tesla DeLorean]

Please try to better formulate your posts with a title, and a body containing the question and some context.

You can typically use an ST-LINK and the ST-LINK Utilities or STM32 Cube Programmer application to pull the current content from a device, and also to write a binary, hex, or object file to an STM32 part.

Other makes/models of JTAG pods will also work in a similar fashion. An the STM32 System Loader provides USART and USB methods, again supported by then STM32 Cube Programmer