The FCC-ID on the E-5400īs back refers to ZCOM as original manufacturer.
This driver is the OEM-WinXP-driver made for the XG-701A/B devices by ZCOM.
It seems that Fujitsu-Siemens changed the product- and vendor-IDs in the firmware of the E5400 USB so that you are not able to install it if you simply download it from ZCOMīs website.
I simply changed this data in the drivers .inf-file with Notepad - thatīs Voodoo Magic! :)
Simply unzip it to a temprary folder and install it from the device manager by selecting "Update Drivers".
You can now select WPA and WPA-PSK!