Can't reset stock rom in Wiko ridge fab

Hello, after I installed the lollipop update for the wiko ridge fab, I rooted it, and I couldn't install the new update. So I tried to reset with the official app from , but it said error. I tried to restore a kitkat nandroid backup, and now the app from the wiko site crashes. If I restore a lollipop nandroid backup the navigation bar disappear. Does anyone know how to come back to a stock rom?

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