Increase USB speed above 115200?

Anyone here know how to get the i3+ with ADVI3++ to connect to USB above 115,200? I’m good with recompiling the firmware if needed.

I’m connecting from OctoPrint running on a Raspberry Pi 3 B+ over a short USB cable. The brief pauses as the printer receives more data from the Pi are causing quality problems with the prints.

Replies to this post I made suggest that upping the USB connection speed may help:

As the USB chip on the printer is a cheap one, it is unreliable at 250’000. But you can however select that speed in the settings of ADVi3++. Non need to recompile.