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HEX file for DFU

Hi all

I used the "Dfu file manager" provided by ST to generate the DFU file.

But I got the failed result.

I used the KEIL C (version 5.10 and 5.13) to build out the HEX file and input to the "Dfu file manager"!! The tool gave me a "Unable to create image from this file" message.

I did not know what the exact steps I need to do.

Could anyone give me some tips or suggestions?

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