Update to 7.0.5 by copying arm9loaderhax.bin from Luma 7.0.5 https://github.com/AuroraWright/Luma3DS/releases
Maybe try redownloading SafeB9SInstaller.bin in case maybe it got corrupted?
These were both correct! I got luma update and a new safeb9 installed right.
Doing the system update step now.