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I never saw any part of this thread.
I've put GPS on spare UARTS on a B&N Glow3.
I have no experience with the Poke2, but I have a Poke3 and a Poke5.
The Poke3 does not have the serial driver built into the stock kernel.
I do use the 1.8V logic level UART as a check during xbl and abl.
The Poke3 does not do USB D+ detecting, so an "EDL cable" does not work.
OTOH, the EDL test points are readily accessible, also adb reboot edl.
There is a Firehose loader available for the Poke3.
The Poke5 does do USB D+ detecting, so an "EDL cable" does work.
The EDL test points on the Poke5 are tiny, but adb reboot edl works.
There is (as of now) no known Firehose loader available for the Poke5.
The two photos are for the Poke5.
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