Introducción
This guide will teach you to use SAFE_MODE, a 3ds family recovery feature which can fix software/firmware issues. It's demonstrated here on a 2ds XL, but the process is the same for all 3ds family systems
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If the system is on, turn it off
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Hold (L) + (R) + (A) + (D-Pad Up)
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While still holding the buttons, press the power button
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Conclusión
If safe mode did not solve your issue, you may need to do a system format. Keep in mind, though, this will delete all user data from your console