"This "over-the-air" software release will not be available through the Nokia Software Updater application, but is available directly through your Nokia N78. The release includes improved stability with Bluetooth (headsets and car kits) and music (playback over a long time and content refresh). This release also includes optimized Camera performance and Naviscroll sensitivity improvements.Technology innovations mean the size of this "over-the-air" update is approximately 2 MB. To get this software through your Nokia N78, click Menu > Tools > Utilities > Device Manager. Select Options > Check for updates and follow the on-screen prompts. Remember that you can also use Wi-Fi to download the update.Nokia provides this software free of charge. However, costs for downloading may be charged by your network operator or service provider. Please contact them for information about pricing.As with all software releases, note that your mobile service provider, operator, or carrier may not have approved this release. Nokia produces many different variants of each product (for different countries and languages) and not all variants have the latest Nokia device firmware. It is our priority to update all variants as quickly as possible."
From allaboutsymbian:
The first over the air firmware update for Nokia N78 (is this the first one on a S60 device ever?),  v11.043, is now available. This new release 'brings more Bluetooth stability, has improved the Music Player refresh time, and includes optimized camera performance and Navi-scroll sensitivity. The update is approximately 2MB and is also available to be downloaded over Wi-Fi. Note that this may not be available for all operators or regions.' "