Oh my God, it was obvious.
Everything is working! thank you!
Then let's go back to HA.
If I just write image from @Igor to a USB flash drive, then boot through the reset clip, I get into the standard recovery.
There is armbianEnv.txt should I also specify FDT there?
Should I place u-boot there too? Just according to @Igor, you just need to write the image to usb flash, insert it into the box and it should load HA without any settings