ok my bad. I found the topic, I followed every steps. The device restarts with the pioneer logo (it used to start with a personnal screen). Unfortunately, I still have the same problems. Reboot every 5minutes, impossible to get access to anything but the general settings, can't play cd (do not eject cd ), and my Iphone can't find the bluetooth. I might receive the official map update tomorrow...but I am not pretty sure my F900bt will work again