2006. The update featured improved performance and stability, a built-in Google Talk client, a refreshed look, and a new full-screen finger keyboard. Because of significant API and architecture changes, existing applications required recompiling. It is the last officially supported Internet Tablet OS release for the 770. Also included was the ability to support 2 GB RS-MMC cards (FAT formatted). The Linux kernel was upgraded to 2.6.16, with the associated patches for the OMAP platform included. This new version uses kernel preemption for improved interactivity. OS2007 OS2007 was released and bundled with the N800 on 8 January 2007, after its unveiling at the Las Vegas CES 2007 summit. It featured significant bug fixes and performance improvements in almost all areas of the OS, bringing updated versions of the Opera web browser and Adobe Flash Player 7, an updated interface and various API and library updates. OS2008 OS2008 was released with the N810 in November 2007, based on Linux 2.6.21, and featuring MicroB, a new Mozilla-based web browser that replaces Opera. It also features integrated Samba file sharing and additional support for Windows Media Player Formats and H.264 and improved support for USB devices, among other incremental UI improvements (particularly in the direction of finger-friendliness). Dynamic frequency scaling (between 165 MHz and 400 MHz) was also implemented, which gave the N800 a 70 MHz speed increase. Diablo Diablo is the codename for the OS2008 Feature Upgrade (corresponding to Maemo 4.1), released in June 2008. Major features include significant improvements to the built-in Application manager, incremental operating system upgrades without reflashing ("Seamless Software Update", SSU), Modest as the default mail client, and a new version of the MicroB browser with better performance and some interface improvements (though still based on the same Gecko release as Chinook's MicroB). Diablo also included an implementation of the WiMAX stack for the short-lived N810 variation called N810 WiMAX edition. SSU SSU, in particular, is one of the most significant parts of the Diablo release, as it eliminates the flash-based upgrade system of previous Maemo releases which required the user to completely wipe their device with each upgrade. With SSU, the user can receive "over-the-air" updates. This also decouples bundled software updates from the major system updates, as was required with the flash-based method, so Nokia can release more frequent updates to individual packages than before. The first SSU update was pushed on 11 August 2008, and brought