Hello @Ekim.1 ,
Thanks for your feedback,
There are two methods to change an MCU by CubeMX. For more details, please check my answer in this thread Changing from STM32F769NIHx to STM32F769BGTx.
PS: Unfortunately the List Pinout Compatible MCUs is bugged in v6.5.0 but it will be fixed. I would advice you to use the import method if you are working with v6.5.0.
I hope this helps !
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Sara.
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