You should probbaly update via CIAs instead if you are able to boot Gateway mode on it. You have a really old TWL_FIRM (with only 1.0 launch fw having one older then yours) and it would benefit you DS flashcart wise if you update via CIA and exclude the update for TWL_FIRM and DS Cart White list. That's what I would do anyways.
Hell, if I ever got my hands on a 1.0 console, I'd have it nand modded so I can eventually decrypt that 1.0 nand image so I can boot it as emunand. Then update that sucker to 9.2 via CIAs while keeping original TWL_FIRM and DS Cart White list untouched. I'd pretty much have the best there is in terms of DS flashcart compatiblity. Anything that worked on 1.0 would work on 9.2 this way and perhaps a few more if I were to "break" the DS Cart White list by installing one with a spoofed version string.
If you don't own any DS flashcarts that were blocked in 4.x. Then I guess it doesn't matter for you.