Oh. Interesting.Not true, it's actually easier and less risky to install B9S directly on their 9.2 Sysnand. It doesn't require downgrading at all anymore, so less chance of bricks and all you need is a homebrew entrypoint to get started.
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Do you have the payloads in SD:/luma/payloads? Also what version of Luma are you running? Newer versions use a chainloader while older ones require the payloads to be linked to corresponding buttons.