Looks like the IN (factory settings) signal was sent right after the I3 (basic powercycle) signal last time so I don't know if it was effective then, but it should have done it that time. Though I'm not actually sure what it resets to factory settings - I know it kicked our "auto-tune to HD" back to "off" but I don't know how many other non-defaults we had.
Any replacement DVR you get will be freshly loaded from a warehouse rack by now, so if all else fails that should do it, but let's see how this does.