Tacx Vortex error E021

Judging by the support answer, such an error means:

Steering computer connected to a brake but they are not paired. So can you reconnect the brake to the headunit.
https://twitter.com/TacxSupport/status/535012881771687936

If this does not help, then try updating the interface firmware:
http://w47.narod.ru/tts4.html#32

Probably, such an error appears if Vortex was previously used not with an interface, but with a tablet, for example.

Hi i have the same issue but I can't fix it :(

7386022 said:

Hi i have the same issue but I can't fix it :(

Press OK and hold down the Right and Left arrow keys together for a few seconds until the screen changes to the firmware version screen.
Press the right key three times until the serial number of the brake is displayed. Press the Up key once to start the search for the brake. Once the brake has connected to the interface the interface can be restarted.

Omg, thank you so much <3. Sorry… I have another question. I have an usb-stick (ant+) but i can’t figure out how I can make it work with the vortex t1961 or is it not possible ?