AOSP master hikey960 not booting

My AOSP master build + flash workflow was working fine a month ago or so.
I synced to AOSP master today. Build is fine + flash is fine, but device fails to boot AOSP. fastboot reboot returns to fastboot.

I see in flash-all.sh the following references https://github.com/96boards-hikey/tools-images-hikey960/ if I encounter this issue. I tried that procedure, but my Mac host doesn’t recognize the ttyUSB device.

Is there a known issue with AOSP master hikey960?

Thanks

I reverted back to a non AOSP master build and my device is now booting into Android. So perhaps AOSP master is broken somehow, or I need a different process to update my board.

Could you attach the output of the debug/console when booting master.