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Here's my situation; I have a 2011 MacBook Air running Windows 7, and I'm looking for a way to change the USB host controller or hub's speed from high-speed (480Mbps) to full-speed (12Mbps).

I know high-speed is backward compatible, but I need the controller or hub itself to run at full-speed, since I'm testing some 433MHz radio hardware that gets some nasty interference from USB operating at high-speed.

On a regular PC I can access the BIOS and configure the USB hardware there, but on a Mac it's a different story.

Any help is appreciated!

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holy crap :P I wish you best in finding a solution! – Clustermagnet Apr 10 '12 at 17:42

If you were to force the USB connection to 1.1 outside of your Macbook, would that work? You could purchase a USB 1.1 hub which would force anything you connected to it to be limited to full speed. Your port/hub at the Macbook would still be high speed, but nothing would be going into the port at high speed. That Hub I linked to is powered, but there are unpowered 1.1 hubs available as well, like this one.

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I did a bit of research and I have some proposals -- please let me know if they can apply to you. Please keep in mind that I'm not an expert in USB devices (specially at such low level).

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