i-remove tools is free for certain devices on certain ios versions there a paid version and a free version that can only bypass a few certain devices iremove tools can bypass iphone 4 for free the iphone 4s but only if your on ios 7 witch is rare the ipad 2 but only temporary for a few and its untethered but for the iphone 4 it is tethered so it stays when you restart the phone but if the phones been sitting a while of or dead for a few months you may have to do it again.