Thanks for this as the April fools joke which I've only just realised was a joke made me un-install magic lantern and upgrade my firmware. I'd only used ML a couple of times so was set to do some filming when the blue screen of seeming death made me panic thinking I'd bricked my T3i. Very frightening experience and since then I've had to do filming without ML which isn't easy. So, thanks to your good advice I've now got Firmware 1.0.2 again and I can download ML and try again - the wiser for it!