Mega 2560 IDE 1.0 - suddenly no upload


The Mega 2560 R2 with IDE 1.0 has suddenly stopped being able to upload new programs. Many reported errors all having to do with avrdude.

  • avrdude: stk500v2_ReceiveMessage(): timeout
  • avrdude: stk500v2_getsync(): timeout communicating with programmer


  • This new behavior is present in all tested IDEs.(022, 023 and 1.0)
  • This is new, it used to work perfectly.
  • My Uno programs/uploads OK, so I think problem is with Mega itself.
  • Passes the loopback test.
  • Used the Reset trick, no difference.
  • No "!!!" strings.

Do I need to burn a new bootloader? I have a Bus-Pirate to use as an ISP, would need directions.

Thanks for all your help,

Dr. Sandy

System: Win7-64,