Ok, I just reflashed Xellous, then updated to XBR w/ Xellous set to load w/ eject key, and I went through the same procedure that I have for at least three reflashes: change keyboard layout/locale, change time/region/date, set the 360 to block LIVE access (and be forced to make and save a passcode). Every time I did this before, after I would turn the unit off, maybe even unplug for a while, plug back in and reboot, DEAD. I'd have to reflash Xellous and start over again.
The difference is that THIS TIME I deleted the avatar the 360 forced me to make when I first turned on and set up the console, and everything else in the MU before reflashing Xellous and upgrading to XBR. As of right now, I have changed all the time/date/place/LIVE settings, unplugged, waited 30 secs and replugged, and it seems to be going swimmingly. I was hoping to find out that changing just one of those settings would cause the NAND crash, so I did them one by one.. but it seems everything is good so far. If it NAND crashes again, I'll reflash and delete the MU. Will post here if this occurs.
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On a side note, is it normal to [predictably] cause a single-lower-right RRoD E71 error with just a flash drive inserted? I tested with it in, with it out, time and time again, and I always made it E71 whenever it was inserted before bootup.