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Solved: When installing Marlin, edit the platformio.ini file and change: default_envs = STM32H743Vx_btt to default_envs = STM32H723Vx_btt Don't follow the instructions on youtube, bigtreeTech site, that doesn't work for a...

Can somebody write down exactly what i have to do to get this board working? I don't understand all this comments. I do have an SKR 3 EZ, firmware flashing...

I have changed the env to the correct mcu, that works a little bit better. The serial connection is now flashing on, off all the time. My settings in configuration.h...

The problem is solved, it turns out that the screen was nor correct connected to the motherboard what causes the on, off flickering of the serial port. Everything works fine...