@aureliusss: Sorry to hear that it did not work for your board.
I assume that you are trying to connect to your custom built Due board? (From your posts in SAM-BA operation failed - #4 by aureliusss - Arduino Due - Arduino Forum)
Note that the R23 fix and the 16u2 firmware fix are intended for Due boards where you can press the reset button to manually fix the "No device found on COMx" error.
If your system is not recognized by the IDE when trying to download after you press the reset button - there is likely something else wrong.
Andrew