You cannot boot anything on 9.0 except OFW so that is why you got the unknown pkg1 version error. However, emuMMC should be able to boot. What exactly was the error code?
The error code when trying to boot on Atmosphere 8.1.0 emuNAND is 2002-2634.
Since I have AutoRCM on that's my only way to boot into Stock 9.0.0 sysNAND without turning it off and that's when I get the unknown PKG 1 before it going back to hekate. I guess I could try turning it off to use OFW firmware for now...