My iPhone says error detected every time I try to update it

Mario,

Whta's your iPhone model? How are you trying to update it? Did you follow all these instructions:--> Update your iPhone, iPad, or iPod touch - Apple Support

If you can't update it wirelessly, do it via iTunes on a computer.

Regards

Giulio

If you are trying to update over the air, try using iTunes, or try using another WiFi network if you don’t have access to a computer.