@Dusty Star: Yeah, I wrote that before the full post (err, actually, probably even before writing the code
), I'll reword that and/or refer to the full post.
In your case, if you remove both, and restart your Kindle, you're likely to encounter the same issue as before the update (ie. blank fonts everywhere).
So, if you can live with big fonts & no browser, just remove the 'bci' one. (technically, it doesn't hurt a bit to leave it, it just generates a warning message in the logs).
If you *really* need the browser to work, we're back to square one if I don't find a way to make the browser work with this tweak enabled.