If your USB devices (eg. USB key, USB keyboard -> “no keyboard detected”,…) stop working during the installation of ESXi 5.5 you can try to change the following UEFI BIOS setting:
- enable EHCI Hand-off in your BIOS USB settings
What is EHCI?
The Extensible Host Controller Interface (EHCI) enables a host controller for USB hardware to communicate with a host controller driver in the software.