Have you tried the below...

How to perform a full firmware update?
On some rare occasions it might occur that the software on the device becomes corrupt preventing one from doing a firmware update. In such a case, follow the steps below in order to perform a full firmware update:

Step 1: Start the firmware updater.
Step 2: Undock the TSU9600 and press the Next button.
Step 3: On the next screen press the Troubleshoot buttton.
Step 4: Place the TSU9600 into the docking and wait for the Repair button to enable itself.
Step 5: Now reset the control panel by pressing the key combination: Page +, Home and Menu simultaneously immediately followed by the next step.
Step 6: Within 2 seconds set the firmware update flag by pressing the following key combination for 2 seconds: Firmkey 2, Firmkey 3 and Firmkey 4 (below the LCD) simultaneously . The control panel will now start up showing a dialog saying: "Application Firmware Download mode, normal operation not possible.
Step 7: Finally press te Repair button and wait for the update to finish.