Acrosser AMB-N280S1 - Manual (Page 23)

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3.2.5 USB Configuration
Option Choice Description
Legacy USB
Support
Enabled / Disabled
Enables Legacy USB support. AUTO option disables legacy
support if no USB devices are connected. DISABLE option
will keep USB devices available only for EFI applications.
EHCI Hand-Off Enabled / Disabled
Enable or Disable the EHCI Hand-Off Function. It Could
Disable if driver of OS is not supported.