I own an itouch 3rd gen and I am debating about rejailbreakiig it because I badly want more free games to play like gameboy or whatever. I just found out there is finally an untethered jailbreak throu greenpoisen for 4.2.1. Would it be risky to rejailbreak my itouch have jailbroken it and unjailbroken it 2, 3 times before?