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After firmware upadte, the Tobii REX suffer from a critical issue : it is well recognized by the Tobii Eye Tracker Control Panel, wich show the good firmware version : “126.96.36.19969.20130705.1446.root” but : it is impossible to setup neither calibrate it. Moreover the showcase demo refuses to start claiming “Error initializing TecSDK : Failed to create instance of tec extension”.
After several tests and finally uninstall the USB-HID driver the showcase demo works. I think it was the issue: the USB-HID driver conflicts with the TCP-IP driver when the TCP/IP firmware is used. However the Tobii Eye Tracker Control Panel still refuses to setup and calibrate.
Finally I change the firmware back to USB-HID, everything goes back to normal.
Hope it helps, Francis.