For firmware 3.1 and 3.1.2 jailbreak use BlackRa1n utility
Utility PurpleRa1n is old, it supports only firmware 3.0. Use blackra1n.
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Tags: 3.0, 3.1, 3.1.2, blackra1n, Firmware, firmware 3.0, firmware 3.1, jailbreak, purplera1n, джейлбрейк