In the run up to their Q1 2010 earnings call, Nokia are getting a number of firmware updates out the door. The Nokia E51 has now had a big update, from v300.34.56 to v410.34.001 firmware, available as a 80MB download through Nokia Software Update or Ovi Suite. A full backup and restore is needed for the E51, since it's old enough not to have User Data Preservation.

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You can find Nokia Software Update in PC Suite or the more current Ovi Suite.