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PwnageTool has no problem working with 4.2.6 firmware...................

Try again with gp, it works. Maybe try turning your phone off first?
 
Can you restore it back to normal if you dont like it? And what all can you not do after you jailbreak it that you couldnt do before?
 
Can you restore it back to normal if you dont like it? And what all can you not do after you jailbreak it that you couldnt do before?

You can restore it back to the factory setting if you don't like it. On the other question, I think you should do more google searching and decide for yourself. Each of us have different reason to jailbreak the iphone.
 
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