I currently have version 1.13.17. I see there is a 3/15 announcement regarding firmware upgrades, version 2, and ESN and ESN Checksum. I'm having a hard time figuring all this out. What is ESN and checksum? Do I need to do something before I can get the latest firmware? This used to be easy to upgrade, but now I just can't follow all the steps. Can someone clarify how I can get the new firmware?