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[title] Try the built-in recovery tools.
[* black] Hold ***[doc]***, ***[enter]***, and ***[EE]*** at the same time.
[* red] Make sure battery is fully charged.
[* black] While still holding down the buttons, press the reset button located on the back of the calculator.
[* icon_note] If the calculator doesn't power on automatically, keep holding down the buttons, then press the ***[home] ***key (twice in a row if necessary).
+ [* black] Select [0] first to reboot the calculator, if it does not help, press [2] to delete the OS.
[* black] Alternatively, remove the battery, hold down the buttons, then connect the calculator to a power source.
[* black] After the 'replace battery' warning appears, connect the battery and try the button combinations again.