No USB device found!

[snet]

Hello, all. My english is not good.

I have a problem installing FreeBSD. I have not CD-Roms, so I use program FlashBoot for convert iso-image to USB Device.
After, I was beginning to install FreeBSD (Sorry my english).

When it's time to choose an installation media, I select 9 USB:

However a message tells me:

No USB Devices Found

My next step was to Re-scan devices:

I use space bar to select this option, but nothing happened.
After that I try again to choose the installation media:

No USB Devices Found

Help me.

 

[Beeblebrox]

Let's check what devices are recognized at that stage. I Don't remember so well, but in the main menu near very bottom you should have something like > rescue or > start a shell. Go there and get a CLI. Then see what you have for devices:
# ls /dev/ad*
Maybe your system thinks the USB is a floppy or a cd-rom?