Problem uploading code to Bluno Mega2560 on Arduino IDE

I've got a new Bluno Mega2560, but I am having trouble uploading the code. Any idea whats wrong?
Code: Select all
Arduino: 1.8.2 (Windows 10), Board: "Arduino/Genuino Mega or Mega 2560, ATmega2560 (Mega 2560)"
avrdude: verification error, first mismatch at byte 0x3bb1
0xac != 0x57
avrdude: verification error; content mismatch
avrdude: verification error; content mismatch
Sketch uses 21446 bytes (8%) of program storage space. Maximum is 253952 bytes.
Global variables use 1413 bytes (17%) of dynamic memory, leaving 6779 bytes for local variables. Maximum is 8192 bytes.
This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.