We in irc just noticed that too when you launch anything specifically from usb; everything from nand directly works fine. even weirder is that even if I start the system menu patchless (by holding l+r+zl+zr on boot) also ends up in this error so it does not seem to be a IOSU related bug. I personally never use usb so to this point I did not notice this yet, as a workaround you can though use a fw.img with coldboot-activated iosuhax on your sd card.

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