https://gbatemp.net/threads/when-to-use-fusee-primary-vs-fusee-secondary.573484/

• Hekate → Fusee-Primary→ Fusee-Secondary
• Fusee-Primary → Fusee-Secondary
• Hekate→ Fusee-Secondary

• These are atmosphere sigpatches, not fss0, so they require using fusee primary (directly or through hekate) to work.
• The patches you linked are for Fusee Primary, off course it ain't going to work without fusee primary.bin. If you want to to boot using fusee-secondary, you have to use Fss0 patches.
• …

• fss0=fusée-secondary
• payload=fusée-primary