03-31-2016 10:32 PM
There is no procedure to boot VDX from USB, that for first.
second, assumed that would work you need Brocade USB Flash drivers, General available USB Pen Drive ( i.e. like a SanDisk, Kingstone, etc... ) not work on Brocade.
If the flash is corrupted you can try to boot via TFTP, I'm not sure if the VDX at the boot menu have a features to set boot from Eth.