Linksys LLC Product: Linksys E2500-RU Classification: Firmware Release History Release Date: Nov 20, 2013 Last Firmware Version: 2.1.00 _____________________________________________________________________ Note: This firmware is only compatible with hardware version 2.1 (v2.1), but not with hardware version 1 and 2. To find out the hardware version of your router, look up the 4th and the 5th character (read from the left) of the product serial number. If they read "21" (e.g. xxx21xxxxxxxxx), the hardware version of your router is 2.1. Firmware 2.1.00 (build 10) - Initial release