Since many people are having problems with this I'll clarify how I was able to downgrade my 11.2E o3DSXL. 1: Download the compiled safehax zip file provided by @zoogie and extract it to your /3ds/ folder. 2: Download Decrypt9 3: Extract the Decrypt9WIP.bin file to the root of your 3DS's SD Card and rename it to arm9.bin 4: Boot HBL through any entrypoint you see convenient (safehax would crash with soundhax, I used OoTHAX) and keep trying, safehax most likely won't boot Decrypt9 on its first run. 5: After that just continue from 3ds.guide P.S: Once you get to the part of installing arm9loaderhax and booting Decrypt9, on 3ds.guide it says to go to ''SysNAND Backup/Restore'' and select SysNAND restore to restore your NANDmin.bin, such option is not correct, what you WANNA select is ''SysNAND Restore (keep a9lh). Huge huge thanks to @zoogie and Ned Williamson. If I made a mistake somewhere, please correct me Also keep in mind that the code you're about to execute (fasthax + safehax) is entirely in alpha, hearts may break. Be careful.