On my Obi202, I upgraded from 5562 to 5589. It rebooted and it showed 5589 but somehow when I checked it a bit later, it seems to be 5562 again. So I repeat the process and it always upgrades to 5589 after rebooting but then later, same thing happens and it goes back to 5562. The file OBi202-3-1-1-5589.fw I have is:
Size: 11,647,648 bytes