Yes. I assume you've downloaded the firmware updater. Change the tsupdater.ini file (this is for a terastation 3000 series). The key is to set Debug=1 under special flags. When in the firmware update app window - right click the mouse and select debug. this will take you to a window with a number of options, one of which is to force firmware update.
[Application]
Title = BUFFALO TS3000 Series Updater Ver.1.15
WaitReboot = 1200
WaitFormat = 600
WaitDiscover = 120
[Target]
ProductID = 0x0000201D
ProductID2 = 0x0000201E
ProductID3 = 0x0000201F
Name = TeraStation
[Flags]
Checkversion = 0
VersionCheck = 0
[SpecialFlags]
NoFormatting = 1
Debug=1
G.