Geez, I had a bit of deja-vu and started to wonder about my original conversation in these forums 2 years ago 
So… no need to boot Raspbian, since I did it a couple of years ago …
I just noticed that both revisions of the Pi 4B in www.ipfire.org - Raspberry Pi 4 Model B link to the same forum conversation. Is that intentional? Both 1.4 and 1.5 require the same boot.cmd changes?
Thanks!
Craig