This seems to be affecting me too.
Around the time the firmware package was updated (plus other kernel-related 
packages), I started having serious problems with USB during boot.
I cannot really be sure it isn't a hardware problem, but I am able to use MacOS 
okay (this is an iMac).

I boot off of an external SSD. To get boot to work I have to unplug my
external HDD and my USB hub, and then plug them back in after the kernel
has successfully mounted the SSD. Otherwise I get USB timeouts and get
dumped into an emergency prompt.

Additionally, sometimes the USB mouse stops working. This has
occasionally happened in the past and I've just have to reseat it in the
USB hub. Now I have to remove power to the USB hub and unplug the USB
hub from the machine, and then plug it all back. i.e. a hard-reset of
the whole USB hub. This is with one USB hub, but I also tried another.

Something is seriously broken with USB.

Is there a supported way to backroll the firmware?

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https://bugs.launchpad.net/bugs/1956518

Title:
  linux-firmware 1.187.24 may crash USB ports

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