Following on from the N78, the venerable 6220 Classic has received an “over-the-air” update which takes its current firmware version to 3.23. The release v3.23 includes improved stability with Bluetooth (headsets & car kits) and Navigation. The 1.5 MB update is available via the device manager – Menu > Settings > Data Mgr. > Device Manager. Select Options > Check for Updates.
Having tried OTA updates on a N78 I can vouch for their ease of use and user data preservation. Updating is highly advisable and quite a breeze, really. However, a backup never hurts.