Thank you all for your anwsers. 
@neutron_bob: No, it doesn’t work either. And I can’t reapply the firmware since I don’t have access to the device from a computer.
@Miikerman: I don’t have any Windows computer in my entourage, but I’ll try to see if I can find one for testing this.
@Tapeworm: Ahaha. And I’ve just called Tech Support, it seems they’re going to replace it!
