UNO Rev 3 Upload Error "avrdude: stk500_getsync(): not in sync"

Development Tools IDE 1.x
1

Arduino UNO started giving upload problem. Earlier it was working fine. Changed driver windows cable etc etc etc but no reponse after 10 attempts it fails.

Checked loop-back test working fine so COM is prefect only problem with sketch upload. Tried pressing reset button but no use.

L Led ON
RX Blink during upload
TX does not blink during upload.

2

The bootloader may be gone. Or you have the wrong board chosen in the IDE.

3

Have you tried with a different computer? Different version of the IDE?

4

Tried everything. Another board works fine on same cable and PC

5

So try to upload the bootloader.