Solved
How to import MDK-ARM project to STM32cudeide
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In this case, I think you should start the project from the .ioc file in this case.
Also, I may suggest you regenerate the project from CubeMX with IDE as a toolchain and unchecking the "Generate under root". This way any user code in the main.c will be kept (not sure about other files added by users).
Best Regards.
STTwo-32
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