Translations:3DS:Safe Mode/1/en
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Safe Mode, also known as SAFE_FIRM, is a part of the 3DS' stock firmware that allows the device to perform a System Update without loading the HOME Menu or most system functions. To access Safe Mode, hold L + R + (D-Pad Up) + A and then powering on - if successful, the 3DS will show the System Update screen.
There is no alternate keycombo, so if one of the needed buttons is broken, you will be unable to access Safe Mode.