I will try it.
I've tried Armbian Bionic (same as Armbian Stretch) nightly builds before, but I had no Wifi and max resolution was 1920x1080 (I have 2k monitor). Plus I did not see mali0 under /dev.
So I thought there's missing mali driver.
I am new in linux so sorry for noob questions...
JMCC, what did you mean Armbian Bionic Default image?
I've found only nightly builds working with kernel 4.2, updating kernel to 4.4 caused boot failure.
On the https://dl.armbian.com/rockpi-4b/, in the "Archive" folder I found 5.75 versions of Armbian with 4.4.174 kernels, but no boot again. Just red led blinking...
So I did not find a way how to get armbian bionic working with 4.4 kernel.
What am I missing?