Download RedSn0w to Jailbreak iPhone 4.2.1

i jailbreak it ….i have downloaded redsnOw 0.9.6 version of it to my pc ..is it safe to jailbreak it ….. Leo Hola ... I have an iPhone 4 (4.2.1) and A friend of mine from computer programming engineering at my university helped get my iPhone jailbroke. My

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