First, contact tech support. Also read this if you have a Pro: http://www.pogoplugged.com/forum/thread/15278/Pogoplug-Pro-Firmware-Update-2....
You said "i'm french and we have specific routers wich come from ISP's (you can't get tv, telephone and internet)". I don't know what you meant by that except that you're French. I hope that doesn't mean that you don't have the ability to hook up your pogoplug to internet. I am also assuming that you have the Pro version since you did not mention which model? If it is a Pro, see the link above, hook up your Pogoplug Pro to the internet for one day, verify you got the update, and reboot your system. Then recheck your drives formatting if everything is okay. Follow tech supports replies. Good luck!