I was having this issue as well, I give it a shot with older versions of goldleaf. Would they work with the new Java applet quark or would I use goldtree for USB loading?
Had a switch in from customer that would only install some nsps and others would error out. Did a system initialize and all games are now working. Got 5 in same day with 9.0 update and only this one did this. Was on kosmos/atmo emunand 8.1.0 previously and was also doing the same thing on 8.1.0.
Finally got around to trying the methods mentioned above. With EmmMMC 9.0.0/9.4AMS|E I used Blawars 0.2.1b tinfoil and fluffy usb installer and it successfully installed the NSPs that were giving the airplane mode error from goldleaf 7.1. Thanks for all the help!
Once again I fell down the martial arts rabbit hole and am plumbing the murky depths of the internet's various martial arts and fighting crafts echo chambers.
If you're not actively involved and only get up to speed every few years or so, you can see the tide of public opinion flapping worse than my dong while I'm skipping naked down a hallway.