luma 8.0 only works on B9S 1.2 if your on 1.0 or 1.1 you'll have to downgrade to luma 7.1 download link here, https://github.com/AuroraWright/Luma3DS/releases/download/v7.1/Luma3DSv7.1.7z
Extract Zip folder and copy the boot.firm to the root of your SD card. then go back to the 3ds.guide and...