Provide an empty, FAT32 formatted and h2test/F3 checked SD –
Don't skip the check – containing only latest Luma3DS
boot.firm and see if you get your console to use the boot file. This means: Luma3DS settings saying "
Booted from SD via B9S" on the very bottom.
if that is the case you can start trouble shooting by preparing an SD like explained on the guide:
(i had to remove the link cause GBATemp won't let me post this without any links lol)
Assuming you can now boot into latest GodMode9:
Start with creating a NAND image and store this image on your computer. This can become very important even if the current status is bricked so
please don't skip it. Even though the know camera problem is an N3DSXL thing, please try Safe Mode / Recovery Mode without SD or with your secondary SD prepared like on the guide.
On the hardware side it could be a problem related to the WiFi chip – but it has to be at least partially working – else you wouldn't see a splash (3DS does not even attempt to boot without WiFi chip). Reseating or trying a spare WiFi board might be worth a shot if software troubleshooting doesn't go anywhere. Keep it in mind for later.