After taking option to download an upgrade, the screen seems to be stuck in a loop. I have the Android icon and the status bar goes so far then restarts. It's been doing this for 10 hours now. I have tried a reboot and I get the black Android screen, then it switches back to the android update screen. The only issue I had was that just after setting off the upgrade I got a message saying that the battery didn't have enough power to complete the upgrade, so I plugged it in, first via a USB cable into my PC, then into the mains. I've logged this with Asus, but if anyone has any ideas, I'd be grateful. I don't have an SD card to hand.