Hi all, 

 

I upgraded my F10Bt to Z140 (F40bt thanks to avic411 users) it's ok but i don't like the new design, so i would like to know if it's possible to downgrade it with the original firmware ? because the original UI was more logical, so, i didn't saved the old one... 

 

Does anybody here have the original firmware ? and how to downgrade ? 

 

thanks