lekko

Of course this is not Armbian. Before we thought about supporting H3 boards with legacy kernel at all Igor wasted one day of his life to patch this insanely insecure and horribly outdated Allwinner 3.4.39 kernel up to 3.4.100 (fixing tons of security issues). In the meantime we're at 3.4.113... and connecting such a Linux installation relying on unpatched 3.4.39 in 2017 to the Internet is almost unbelievable
 
@thkien: Currently Armbian's build system applies 144 partially huge patches to fix countless issues on H2+/H3 boards and to enhance a lot of stuff: https://github.com/igorpecovnik/lib/tree/master/patch/kernel/sun8i-default (when you use 'hardware vendor offerings' you miss all of this!)

I already done it using nmtui utility, but it works only on Mainline 4.9.3 Ubuntu Xenial (nightly releases). Hostapd didn't tried.
 
So I conclude that something wrong with drivers in legacy 3.4.113

Here is my W1 Overlay that I use on OPi+2E, you can tweak it to change the pin number you wish to use.
/dts-v1/; /plugin/; / { compatible = "allwinner,sun8i-h3"; fragment@0 { target-path = "/"; __overlay__ { w1: onewire@0 { compatible = "w1-gpio"; pinctrl-names = "default"; pinctrl-0 = <&w1_pins>; gpios = <&pio 3 14 0>; // PD14 status = "okay"; }; }; }; fragment@1 { target = <&pio>; __overlay__ { w1_pins: w1_pins { allwinner,pins = "PD14"; allwinner,function = "gpio_in"; // in (initially) allwinner,pull = <0>; // off }; }; }; __overrides__ { gpiopin = <&w1>,"gpios:4", <&w1_pins>,"allwinner,pins:0"; }; };

If you just want to setup an access point, you can use nmcli, like this:
sudo nmcli connection add type wifi ifname * con-name my-connection-name autoconnect yes ssid MySSID mode ap sudo nmcli connection modify my-connection-name 802-11-wireless.mode ap 802-11-wireless-security.key-mgmt wpa-psk ipv4.method shared 802-11-wireless-security.psk 'MyPassword123456' sudo nmcli connection up my-connection-name