What troubleshooting we should do when failed to upload a new program.
Make sure you strictly follow the above steps to upload the program. ( make sure connected with USB cable, choose correct serial port and Board)
Please remove the Bluetooth/2.4G module from the mCore board, then upload program again to have a check
If it says “upload finished” when you do upgrade firmware, while says “upload failed” when upload a new program, please check if there is any other Arduino software installed in the system. Please close it if there is.
If both the Upgrade firmware and upload program fail, try to change the USB cable, USB port or change a PC to have a check.
Try to change some new batteries. According to our test and research, it is suggested to use rechargeable Li-ion battery or rechargeable nickel-metal hydride, nickel-cadmium which can be bought from amazon or local shop. Or Alkaline battery with good quality like Energizer, DURACELL.