Did you follow these intructions? Updating Firmware | Adafruit Feather M0 WiFi with ATWINC1500 | Adafruit Learning System
If so, what are the errors you are seeing?
Did you follow these intructions? Updating Firmware | Adafruit Feather M0 WiFi with ATWINC1500 | Adafruit Learning System
If so, what are the errors you are seeing?