Thank you very much it worked !!!
For people getting on this thread, here is the short version of the solution :
- Go to the settings of the Formuler (not the MyTVOnline)
- Go to System Information
- Go down to the latest option in the menu (don't go in)
- Press 10 times 0 on your remote control and the Formuler will start to fully reinstall.
Thanks again woste