GM9 will open only if I press Start. So the boot.firm can't be GM9, right? If I don't press anything at startup, nothing happens.
Regarding my question, booting via CTRNAND isn't really the objetive per se, what I really want to do is be able to boot by whatever means possible (included getting rid of Luma, if possible), since I do have legit DS games, and if I remember correctly those are stored on the internal memory, rather than on the SD card
EDIT: The console used to boot if no SD card was present. It would only give the "failed to apply 1 FIRM patch(es)" if there was a SD card present, but the files needed to boot weren't present. I'm not really sure why that changed...