Have you ever gotten a message from Game Disc Emulator, asking if you would like to update your Sidecars firmware from such things as "FF.FF to 61" , etc...? First, DO NOT DO THAT. This should come as no surprise, but this is merely a glitch that GDE assumes your sidecar is "out of date" on terms of firmware version - however it is not! This error seems to be thrown when your sidecar is stuck in "emulation" mode, without the USB plugged in. This mode can get stuck when you hit "emulate" on GDE, and then remove the sidecar USB while still emulating. The sidecar will function normally but will have an extra 1-2 LEDS on the bottom board active. It will continue to act this way until you disconnect power and fully reset the kit (just unplug and it's good) however... updating your firmware in this case of a glitch, will show an update progress bar, which will quickly fail after 2-3 seconds. (because there's nothing to actually update..) - Your kit will function normally until a full power-down. Next bootup will cause RROD. I have a track record of TWO dead sidecars now, due to this exact issue. A zephyr and an XNA sidecar.. Take my word, avoid this update, save a sidecar! I'm glad to finally be able to narrow down this issue to the "update" of GDE itself. Hope this can help you in the future..