Get your brother to re-jailbreak it for you again. This time, sit beside him and watch what he does, take notes if you must and don't fall asleep

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If you want to know the simplest way -
Absinthe 2.0.4 Released {iPad2,4 is now supported} - SiNfuL iPhone. Take some time to read through the thread thoroughly. Alternatively, google and youtube are your friends. If all else fail, come back and post your challenges in this thread. Do not open a new one.
Good luck.