I was playing around and thought I would copy update.img to the root of my External SD. I left the tablet for a while then turned it on again and there was a message on the screen: "An update has been found in mnt/external_sd/update.img, would you like to update?" So technically we should be able to run updates straight from the SD card which saves having to use the rock tools. I haven't tested this out BUT if someone wants to then try it out. 1) Copy update.img to root of SD 2) Mount SD 3) Unmount 4) Mount 5) Wait and see if the message appears.