Can't disable touch anymore

Hello, in my Touch Lux 5 (PB628) I used to use double menu button to disable touch (and re enable it in the same way). Now the "double menu to disable touch" does not work anymore and in settings/ personalize/ KeyMappings/Global/Menu (double press) I can't find "disable touch" as before (and as expected). I can move to the previous firmware but I don't know hot to download it. Any ideas? Your "double manu to disable touch" is still working?

Thank you.