11-30-2016 08:50 PM
you can order the USB Flash Driver trough you Reseller or OEM.
there are two USB Flash capacity model:
the one is old 2GB, an New 4GB
keep in mind, 4GB Capacity is supported by FOS 7.4 and above.
btw. FOS Upgrade is very easy trough FTP, the USB Flash Drive is not mandatory to upgrade the FOS.