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Hold the left shift key, the space bar and the back key then the power key, hold them until the device asks for the country etc.
If your device fails to boot up or gives a contact the retailer message then a hard format on boot may usually sort the problem.
Hard reset will DELETE all user data on the device memory, including contacts, calendar entries and any apps etc you have installed to C: drive, your mass memory/memory card will remain unaffected so any data will still be there, however you may have to reinstall some-apps even if they are installed to mass mem/mem card.