Translations:3DS:Safe Mode/1/en
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Safe Mode, also known as SAFE_FIRM, is a part of the 3DS' 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+↑+A and then power on the console. 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.