The Nokia N86 8MP has received a minor firmware update, taking it up to v21.006. New firmwares generally bring new features and bug fixes, so we recommend you update you devices. The Nokia N96 supports FOTA (Firmware Over-The-Air) so you can update your device easily by dialing *#0000# at the home screen then pressing options and check for updates.
If a new version is not yet available then try using NSU (Nokia Software Updater) as it generally takes a while for the firmware to become available over the air. The Nokia N86 does support UDP (User Data Preservation), but we still recommend you perform a backup just in case. There is no official changelog as of yet, so leave some comments below to let others no of anything new you experience.