GameStation - NINTENDO 3DS CFW SERVICES ALL FIRMWARE ARE SUPPORTED OLD 3DS regular, OLD 3DS XL, 2DS, NEW 3DS NEW 3DS XL DOWNGRADE from 9.3-10.3 as of now currently supported AUTO BOOT
Downgrade your 3DS to 9.2.0 | Code Donut
3DS: Downgrading to FW9.2 Tutorial - Hackinformer
Downgrade Latest iOS 10.3.3 to Older iOS 10.3.2 Firmware
3DS: System Software Downgrade Tutorial (Updated!) - Wololo.net
3DS] How To Upgrade/Downgrade To a Specific Firmware - YouTube
[11.15] Nintendo 3DS (2DS) [Safe] Downgrade-Guide [Deutsch|HD] - YouTube
Attempted downgrade, 3DS can't open home menu. Advice? : r/3dshacks