Will everything be erased if I upgrade the firmware of 6600?

Hi,
just here to find out will everything be erased if I upgrade the firmware of 6600?
What i mean is the files and programs stored on my 6600, will they all be wiped out if an upgrade of firmware is performed?

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normaly the Nokia service center back-up's your phone memory, but it's always possible something is erased...
Your MMC card stay's untouched...

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I see... Thanks for the info

Mavi forum