Update on this: After confirming that I implemented the Shine 4 support properly and having a member test my builds, I've finally fixed the Vision 6 (and Shine 4) having inverted warmth light controls.
I also added a toast notifying you to enable "Modify system settings" permission if you haven't allowed that permission for KOReader. Originally I implemented an intent to just pull up the settings page for said permission but that caused KOReader to crash and I feel its way beyond my knowledge to currently fix.
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