OK. I attached the leads from the reader to the points shown on the motherboard of the XBOX, not directly to the EEPROM chip its self. At first I tried to read the EEPROM by introducing an external power sources, in my case an ols mobilephone battery. I couldn't get the set up to work. I then reassembled the xbox (less top cover, but still with EEPROM reader leads attached) without the external power source. I turned the xbox on and pressed the read button when the xbox was booting/rebooting (it does it fairly quick with these leads attached). I was able to get a good read like this. It is this read of the EEPROM that I used to try to unlock the HDD without success.