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Are you saying that when you connect your iPad in DFU mode iTunes gives the message that it sees an "iPhone" in recovery mode? This would indicate to me you have an old version of iTunes. You should make sure you have updated to the latest.
Then simply connect the iPad and press restore. If this does not work, please give more details of the EXACT messages shown on screen. There is not enough detail to assist you from the information you gave above. OK?
For example, is it an iPad1 or iPad2, and what version of IOS did it have on it?
When you say an offline restore, do you mean a manual one, where you select the firmware file? What file are you using? Are you sure it is the correct one?
Did you download it from our sticky here? - http://www.ipadforums.net/ipad-hacking/24939-official-apple-ios-firmware-download-links-ipad.html
It sounds to me like you may have an incomplete or incorrect IPSW file for the restore.