Using STM32F750B-DK

You can use STM32F750B-DK

https://www.st.com/en/evaluation-tools/stm32f7508-dk.html#sample-buy

I did it experimental 22-02-2022 and it says that it hid the memory limits but the keyer work like on the stm32f746 board.

I will look it to it, but now you can get on 

Remember to use another loader for the flash