Problem updating Arduino WiFi Shield's Firmware I'm using Arduino Uno R3 and the official Arduino WiFi Shield R3. I'm trying to update the Shield's firmware to 1.1.0 through this guide.

Everything goes fine until Step 9. When I execute the code in Step 10, I get an error (see attachment) as:

AtLibUsbDfu: 3EB 2FF8 no device present

FAIL Could not open USB device. 

ISP done.



EDIT: I re-installed the firmware on my shield and now the problem's gone.
I cant comment because of reputation... You've already upgraded the firmware. Just when you try upgrading again your wifi device is rebooting itself because of upgrading before.