I've found why some people say it's possible to feed power via Pi-2 and some say it's not. There is a jumper (J9) to bypass the MT3608 power regulator, but only in the Pine A64+ 2GB version, at least in the Rev C. So yes, it's possible in A64+ 2GB Rev C (maybe also in previous revs), but it's not possible in any other version, at least for the moment.
Provide power in via Pi-2 header
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