I successfully upgraded my X920 to version 4 using the guide from the first post and wanted to give some feedback based on my experience. Some of the installation details are somewhat murky because of how long this thread has become. If there isn't one already, a consolidated step by step should be posted in the forum's FAQ area.
- You will need at least a 4GB MicroSD card to do the firmware and map update at the same time. 8GB cards can be found on Amazon for $7.
- The torrent file has a folder inside of it that has a file you need to copy out in addition to the other two files on the or
