Updation of Arduino AVR Boards

1

I am using IDE 1.6.9. and after updating Arduino AVR Boards to v. 1.6.12, I can no longer upload to board. Going back to v. 1.6.11 and it works again.Tried this on Arduino Mega2560 and Nano. Same result.Any idea? i have just bought Arduino
products from this Arduino Uno R3 Price in Pakistan

2

the latest Arduino IDE is available here:

https://www.arduino.cc/en/Main/Software

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