I have a previous edition of this board, and it appears that the most recent version is at F1, with what improvements? I'm not sure why, but I can't seem to find any logs for the many board modifications on other boards.
Latest revision is quite newer: https://github.com/OLIMEX/OLINUXINO/blob/master/HARDWARE/A20-OLinuXino-MICRO/REVISION-CHANGES.txt