See f4780y's link for information on the hosts file.
Also, the way I understand it, you can't go back from 5 to 4.x if you've got an iPad 2 3G (WiFi only is ok), since upgrading to 5 changes the baseband, and you can't get that back to 4.x, even if you have the SHSH blobs.
Also, the way I understand it, you can't go back from 5 to 4.x if you've got an iPad 2 3G (WiFi only is ok), since upgrading to 5 changes the baseband, and you can't get that back to 4.x, even if you have the SHSH blobs.
Where is this file? I tried so many times and kept getting errors. I I'm on 5 and would live to put back 4.3 3.