avrdude: verification error, first mismatch at byte 0x0042 0xb8 != 0x15

Development Tools IDE 1.x
1

Hello, I am trying to upload the simplest sketch (Blink LED - Arduino Workshop Book) to Arduino UNO. But at the end of the uploading I receive this error message:

Arduino: 1.8.1 (Windows 7), Board: "Arduino/Genuino Uno"

Sketch uses 928 bytes (2%) of program storage space. Maximum is 32256 bytes.
Global variables use 9 bytes (0%) of dynamic memory, leaving 2039 bytes for local variables. Maximum is 2048 bytes.
avrdude: verification error, first mismatch at byte 0x0042
0xb8 != 0x15
avrdude: verification error; content mismatch
avrdude: verification error; content mismatch

I have already:

  1. checked drivers are update (I downloaded the IDE 1.8.1 from https://www.arduino.cc/en/Main/Software)

  2. checked the right Arduino version is chosen from Tools --> Board --> Arduino/Genuino Uno

  3. checked the right Port is chosen from Tools --> Port --> COM5 (in my case with Window 7)

Could you please give me help to find a solution? I have looked on other posting and I tried to make sure all the suggestion where followed but still I cannot upload the program.
Thank you in advance

2

(deleted)

3

Yes it is an original Arduino UNO.
The drivers are installed directly when you plug in the USB cable first time after you have installed the IDE. I checked that they where updated and when I did that the message from window was saying that the latest version of drivers where already been used

4

Do you have anything connected to pins 0 or 1?

If not, that's a bad omen...

If yes, disconnect them.

5

Nothing is connected to the board, the sketch is meant to make blink repeatedly the led at pin 13 for 1 second. So there are no connections.