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Nokia's desperate "Money Back Challenge" hopes to boost Lumia 800 and 710 sales
![Nokia's desperate "Money Back Challenge" hopes to boost Lumia 800 and 710 sales](https://tech.firstpost.com/wp-content/uploads/gallery/2012/jul/lumia_800_money_back_challenge_071518238231_640x360.jpg?im=Resize,width=720,aspect=fit,type=normal "Nokia's desperate "Money Back Challenge" hopes to boost Lumia 800 and 710 sales")