I just recieved a few Mikrotik Hap ac lites and the firmware version is 6.48.6. Mikrotik common procedures wiki states " OpenWrt is not compatible with the bootloader of RouterOS v7 or v6.46" . Following the instructions I can upload the firmware 6.45.8 and run /system package downgrade and that works and shows "RouterOS v6.45.8" in the ui when I log back in but the /system routerboard upgrade command fails with "ERROR: can not change firmware to this version, please try newer one"
I'm stuck with
factory-firmware: 6.48.6
current-firmware: 6.48.6
upgrade-firmware: 6.45.8
So can I install openwrt or is it impossible?