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The safest / recommended option would be to to use the standard "Nokia Software Updater" via USB cable. Also it is better to have a stable/dedicated broadband connection. What I mean is avoid wireless/HSPA internet connection for updating if possible.
Good luck ...
Pls click the green star at left if you find my post useful. C3-00 V07.20 Devices since 1999 Motorolla A130 ETACS, MicroTAC ETACS, M3788, Accompli 008, C200 Nokia RinGoIII (NHX-7A) ETACS, 7250i, 3210, 5210, 6030, 3230, 2300, 2310, 3110c, 6300 Ericsson KF788 TDMA, A1018s Sony Ericsson K510 Samsung SGH-600, C210, GT-C3200 Blackberry 7130g