Ok..I could tested my self and I can confirm that jul 31th version boot with 3GB RAM model and also with keyboard (keyboard didn't work in stock OS). One version before didn't work at all.

And I understand your post about that red light..because even with second boot it lit quite long, before boot.

It doesn't ask SIM-card pin, so cannot use mobile data at all.

I noticed so far:
If you try set clock in Clock-app it crash saying "internal error".

Calculator doesn't work..cannot write numbers.

User Guide-app loading short time and shut it down.

But Terminal works! And expanding partition script was nice.
EDIT: how to write with Pinephone keyboard "-"? FN+7+shift gives "_" and FN+9+shift gives "_".

Is there anyway to debug why it doesn't ask SIM-card pin?

Is there anyway to use Docking Bar Ethernet-port?