I don't have a Mega 2560 but it sounds like you will have to burn the chip with a bootloader using the ICSP interface.
Watchdog is enabled!
Your bootloader cannot get access before the watchdog times out.
I don't have a Mega 2560 but it sounds like you will have to burn the chip with a bootloader using the ICSP interface.
Watchdog is enabled!
Your bootloader cannot get access before the watchdog times out.