If you followed this guide:And if I take the SD out, it will still not boot. Is this a problem?
I'm guessing you're about to tell me you skipped part of the guide?Was that when you were supoosed to press A + X?
So you didn't check if the file really ended up on your CTRNAND?If it is, because I accidently pressed a + b
1) Are you sure you're on B9S, not A9LH?I tried, won't boot.

I would like to mention that reformatting your SD won't help in this situation.Well.... I already formatted my sd, will it still work
So you already tried downgrading to 7.1 from the Luma release?I tried, won't boot.
If you can get your system to boot with 7.1 without touching anything just yet. Follow this guideI'm using B9S, I did this last week. The boot firm is from 7.1, the properties say this is for FAT32.
No disrespect, but I already told him everything you just saidI would like to mention that reformatting your SD won't help in this situation.
So you already tried downgrading to 7.1 from the Luma release?
If you can get your system to boot with 7.1 without touching anything just yet. Follow this guide
https://3ds.guide/updating-b9s