Just out of Curiosity, why use Gateway if you're already using Luma? Because if it's cheats you need ntr would have you covered.
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In a word? Laziness lol. I got used to GW and loading up games on a microsd, and using cheats with them. It's my own damn fault I guess. I knew the risks of updating while in GW mode, which is why I double-checked to make sure I was in Luma mode first. I didn't realize that simply loading the GW payload at boot would destroy A9LH. What a costly lesson.