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I learned some more...
The stuff with USB EDL cables and D+ to ground is dependent on whether that is detected/supported in the SBL (secondary bootloader, known as xbl). I'll try to disassemble the Poke3 xbl and see what I can see. Mmm, it doesn't look like anything pays attention to the USB PHY... So, no?
OTOH, the "EDL test points" are supported in the PBL (primary bootloader) and is therefore always present. Whether that's broken out to an accessible place is a separate issue.
I have a Android command line utility for monitoring GPIO 57. If you have rooted Android running that would make it very easy to identify the EDL test points. OTOH, this is a bit logically circular.
If I had a Nova Air (even with broken/missing screen) this would be a lot easier to figure out.
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