ios 7.1.2 unable to jailbreak using Pangu 1.2.1

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recently i download an app from cydia and it crashes and i need to restore my iphone 5c to iso 7.1.2, also i download the new version of Pangu 1.2.1. When i plug in my iphone and run Pangu, it tell me my iphone have already been jailbreak. And advice on this.

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