I have Mysensors running with nrf24 , I wanted to upgrade Armbian to the latest Stretch. I configured DT overlays by adding

verbosity=1
console=serial
overlay_prefix=sun8i-h3
rootdev=UUID=bd0ded76-1188-4b52-a20a-64f326c1f193
rootfstype=ext4
overlays=w1-gpio uart1 i2c0 spi-spidev
param_w1_pin=PA20
param_w1_pin_int_pullup=1
param_uart1_rtscts=1
param_spidev_spi_bus=0

to /boot/armbianEnv.txt. I had spidev working, but not the mysgw. It doidn't give me errors, but i was stuck at !TSM:INIT:TSP FAIL.
Maybe the problem is that there is no gpio-sunxi in Stretch... I have no idea.

By the way, i noticed that the new version of Mysensors calls nrf24 transport differently, it is now called --my-transport=rf24.
Please update the guide for Armbian Stretch.