i pad 3 has 7.1.2 with pangu jailbreak, should i upgrade to 8.0 or 8.4 and jailbreak it? and How?

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i pad 3 has 7.1.2 with pangu jailbreak, should i upgrade to 8.0 or 8.4 and jailbreak it? and How can i do this without itunes.

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