Ok, so here's what happened: I was installing cfw on my new3DS XL (11.3.0-36U) and followed 3ds.guide to the letter until the 'Installing arm9loaderhax' part. I went onto the browser to http://2xrsa.3ds.guide and it gave me a glitched bottom screen and froze. I shut off the 3DS (first fuckup) and turned it back on. I saw glitched colors on both screens (the upper screen was flickering colors and the bottom one was orange-y). I then thought I could fix it by going back to http://2xrsa.3ds.guide (it worked now) and doing a full install (second fuckup). Once it finished and pressed a button to shut down, I realized I forgot to back up <serial_number>_nand.bin (third fuckup). I haven't touched my 3DS yet, it's turned off and I'm scared to do anything else. TL;DR I'm a dumbass. Please help! What should I do?