Boot from usb 1.1

[Quisquens]

Hi,   Greetings to all members of the forum

I have a Fujitsu Esprimo Mobile v6515 laptop. It has OHCI USB 1.1 and EHCI USB 2.0
Unfortunately, it boots from USB using 1.1 version, so USB boot is not usable because is too slow.
I tried Plop, but even with it, the boot is extremely slow.
Please tell me how to do a boot with USB 2.0 speed