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3DS: System Software Downgrade Tutorial (Updated!) - Wololo.net
Downgrade your 3DS to 9.2.0 | Code Donut
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