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I've formatted a fresh CF card and put the 1.13 firmware file on the root directory. Fresh battery in the camera and go to Firmware in the menu (v. 1.21). I select the option to Upgrade>OK. From that point on the red light on the bottom of the camera (lower right back) just flashes and the camera is essentially dead. No further menu option to confirm the upgrade to 1.13. I have to turn off the camera, remove the battery completely and restart the camera, which starts up fine again in v1.21. Scared the heck out of me because I thought maybe I would brick my camera by turning it off in the middle of it doing something, but it never gets far enough to actually update the firmware. I have tried with a couple of versions of the 1.13 .fir file (5D3-113-bootflag.fir and ml-5D3-113.fir) both found via these forums and popular on-line ML tutorials, and two different CF cards. Anyone else have a problem downgrading? Ideas?