I know it may seem obvious, but did you check the pins of the BOOT0 switch itself and the nearby capacitor? A stray bit of solder there could cause the switch to appear always held down by shorting either the cap or the switch. It doesn't appear that the boot0 line goes anywhere other than there and the main microcontroller so the issue is likely there.
this post was submitted on 27 Oct 2023
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Ergonomic, split and other weird keyboards
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