Hi.With certain Samsung boards, if CLK, CMD ,D0 & Grnd Points are correctly connected and fail to read. Switch off the VCC power supply to the Board first. Click read and in less than 5 seconds put on the VCC 3.3V to the board.
![Удивление O0](http://televid-sib.ru/Smileys/KOLOBOK/ai.gif)
you will see wonders. I have managed to successfully read and write many of them this way.
Please do not ask me to explain why and how, i just discovered this after ba lot of unsuccessful attempts.