okay, an update:
I used x2 4983 as suggested by Scar at #xbox-help on Efnet.
I put in a new 9-volt battery and put both dip switches on Mode 1 for testing.
After flashing, I put the chip in my xbox, started it up, and shifted it around a bit until my red flashing LED turned green, then I secured it.
With a CDRW disc with EvoX burned on it, I started up again: Error 16.
I removed the CDRW and restarted: Error 16.
Is it something relating to the CDRW? Maybe I burned it wrong? It can't still be the chip because, as I said long ago, before I had flashed it, turning my XBox on showed me a red X logo; post-flashing, I got the generic green startup animation to the X logo to Error 16, which research tells me is:
16 - dashboard - Other files to do with dashboard / dashboard settings (specific dashboard error) So what now?
![huh.gif](http://forums.xboxscene.org/html/emoticons/huh.gif)