Didn’t have time to check UI, but
netboot-manager regen now works, AP is able to download boot image and I was able to netboot-manager accept , omnia created mox_ boot image
After reboot mox_ is downloaded from tftp and mox is connecting to ssh periodicaly in one minute internal
2019-06-10 10:08:52 info sshd: Accepted publickey for turris-netboot from x.x.x.x port 55846 ssh2: ED25519 SHA256:…
2019-06-10 10:08:52 info sshd: Received disconnect from x.x.x.x port 55846:11: disconnected by user
2019-06-10 10:08:52 info sshd: Disconnected from user turris-netboot x.x.x.x port 55846
But it seems AP is not working. There are two fast blinks of diod every cca 1sec.