Update: by adding "kip1patch=nosigchk" to bct.ini I was able to get everything working again, thanks for the fix (as Draxzelex said, almost everyone has a different bct.ini file so I placed it on a different line). Only works when launching directly with Fusee-Primary, though. When I boot the Switch using Hekate, it doesn't work.
You are looking at the wrong thread then, this thread is for fss0/fusee-secondary/Hekate boot (I made that mistake too). There's another thread for fusee-primary/Atmosphere boot: https://gbatemp.net/threads/sigpatches-for-atmosphere-fusee-primary-only.567542
Why are people still struggling with the missing nosigchk line in the ini?
That was updated in OP days ago and added back.
They probably still have the old ZIP? If people don't care about custom config, just drag and drop. Otherwise, edit hekate_ipl.ini to include nosigchk line. You might have to explicitly state that to clarify.