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As far as I can tell, the baud rate of 115200 is hardcoded in Marlin's Configuration.h https://github.com/prusa3d/Prusa-Firmware/blob/4728bf218263376e4bac5e57d96f68765dda8fba/Firmware/Configuration.h#L81 . So to use a higher baud rate, no matter if through a physical serial connection or the USB CDC, we would have to use a custom Marlin anyways.
Exactly: Here you can see how the 16u2 copies the line encoding of the CDC ACM to the UART.
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