I know it's a weird question for the b9s/sighax scene... But I'm just little freaky and wanted to do something crazy. I'm on a b9s 1.2/Luma 8.0 Japanese N3DS console and attempt downgrading my 9.2.0-20J EmuNAND to 4.4.0-10J (yes, back to o3ds generation), using that sysUpdater by profi200 with a update package downloaded by 3DNUS (missing mset and spider from Internet), and showing I don't really know what's up with Homemenu title, but I guess it's protected by CFWs (most CFWs include forced FIRM protection for noobs), I tried CakesFW (as FIRM protection can turn off) but it have problem with b9s and keep giving me "failed to decrypt cetk" error and can't do anything. Really headache. If anyone can provide information of downgrading, I would greatly appreciate.