Was stuck on black screen after Nintendo logo when I tried to upgrade firmware to 9.0.0 with sx os 2.9 choidujourNX 1.01 so like another post mentioned I booted atmosphere and installed firm 9.0.0 again with choidujourNX 1.02 and it works fine again.
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I don't know much so I probly won't...
I was stuck at the Nintendo logo black screen loop after updating my switch sx is 2.9 to firmware 9.0.0 with ChoidojourNX 1.01 fortunately i could still boot into rcm so I booted up atmosphere like the other post said and updated my firmware through choidojourNX 1.02 and it works fine now.
