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you can't.

step 1: firmware:3.55 and jailbroken
step 2: you need PPC which is hardest ever.. And c which is basic so you gain good understanding
step 3: You need to learn code caveinng injecting a certain blind spot with code. and a jump call. It easier on asm ppc well...
step 4: you need to compile a programs to perform this shit. I was trying Ida no good. Since it Extremely hard to compile the program without open source code. F it.... Till you can. Hacking it is easy part building the program well....
All credits to TheUnkn0wn partially me...