My HK1 is working great with meson-sm1-hk1box-vontar-x3.dtb. HK1 is same as VontarX3. I'm not sure if h96max x3 is same hw.
You could try meson-sm1-hk1box-vontar-x3.dtb from https://forum.armbian.com/topic/15376-methods-to-fix-x96-max-pluss905x3-gigabit-ethernet-problem/
Sorry. I don't have intention to polemize. I thought I was on Home>Community forums >TV boxes
Looking info for Tv boxes. Not interested on dev pcb at the moment.
Damm it!
I just bought a HK1 (S905X3) the day before!
In spite I carefully read forums, it was not clear to me which RK3399 is full supported. None seem to be good enough.
Please, tell us about last version we can install on AML.