Hard format

to hard reset when the device is off hold down the green call key, the number 3 key and the *+ key then continue to hold the keys and now hold the power key, hold all 4 keys until the device boots up and asks for the country etc.

[You must be registered and logged in to see this image.]

For Nokia 5800 XM

Quote :

*NOTE If you own a nokia 5800 XM then the second option is:
Hold the green and red call keys, the camera capture key and then the power key, hold them until the device boots up and asks for country etc.

[You must be registered and logged in to see this image.]

Nokia n97

Quote :

NOTE if you own a Nokia n97 then the second option is:
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 will usually sort the problem.
WARNING doing a 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.

[You must be registered and logged in to see this image.]