I have been trying to get AREDN into a new hAP ac lite. After almost two weeks of trying, I finally succeeded this morning.
MikroTik calls the process of loading firmware into a node via an Ethernet port (usually Port 1) EtherBOOT. Their version of Tiny PXE is called Netinstall. The setting up of Netinstall to deliver a RouterOS package to a MikroTik node is much like what we do for AREDN with Tiny PXE. However, Netinstall appears to only transfer RouterOS code to the node. I tried uploading the rb.elf file, and it would not take it.