Frenetic what revision of ArmSID do you use? is it a newer one, or an rather old one that was sold on Revision some years ago?
I'm currently using the I think newer revision with the parts on the underside of the ArmSID board.
I have the very first revision of ARMSID with components on the upper side... it was not reliable detected by the FW update program, but on the 3rd or 4th attempt it did update to FW2.15 and detection worked.