So you need 51.28 firmware, you need to completely unzip it before opening the .ino file with the Arduino ide. Select the proper communication port and the mega 2560 as the board and then press the arrow to compile and upload it.
So you need 51.28 firmware, you need to completely unzip it before opening the .ino file with the Arduino ide. Select the proper communication port and the mega 2560 as the board and then press the arrow to compile and upload it.