Hey to all of you who think this guide is obsolete, it is not!!! I fixed my GT-I5800 with another similar guide. The difference is that this guide has a mistake. The reason most of you aren't getting the # when you type in su is because your phone HAS to be rooted and it has to have superuser installed, it makes sense, doesn't it? Superuser=su so I did it with superoneclickroot download it, anyways, you don't have to root it for the first steps, you can always obtain the nv_data.bin without rooting it, by copying it to the sdcard. Once you extract it from the SD card, just download any hex editor and go to 04a05 and change DA to DB, then save the nv_data.bin file and replace the one on the SD card with this one you edited. Then you HAVE to root your phone and have superuser installed so this is the guide I followed if any of you want to check it out, I can guarantee by personal experience that this worked. The thing is, you HAVE to root your phone!!!!!! HOPE THIS HELPS www. wikihow. com/ Network-Unlock-Samsung-GT-I5800l-Using-Only-Your-Computer