After sending mail to FA, they changed wiki page for K1 Plus. Now it is more understandable. But problem persist.
I did all according to their wiki:
format TF with HHDLLF and insert in PC again to make partitions
burn Adnroid image as product width PhoenixCard
format eMMC as TF
insert both cards in K1 Plus
power it up
Power supply is 5V/3A and i boot this board width Android, FriendlyCore, Armbian, DietPi without single problem. All from Kingston class 10 8GB TF card. So cables are ok, supply is ok, HDMI screen is ok, K1 Plus is... ok, i think. When i try to boot this board from eMMC, board do nothing. Green LED isn't flashing, only red LED is lit up. Output is through HDMI. This board should write OS from TF to eMMC after first boot, then, power it down, pull out TF card, and it should boot from eMMC, from now on. But it is not.
Problem could be:
bad K2Plus after all - bought from FA
bad eMMC (or Emmc-TF adapter ??) - bought from FA
bad Android image - also from FA
or after all, i don't do something right
I send them mail again, i hope they will answer. Meanwhile i post here, if someone made this works. Any help would be nice.