:Warning! Your device will be set back to factory default
settings. Please ensure any additional installed programs
and/or user data have been backed up before a hard reset is
performed.(大意:恢复出厂设置,请确认已经备份各种数据!)
放开音量上调键(up)和音量下调键(down)。
按音量上调键,确认硬启,按其他任意键退出硬启。
根据屏幕提示再按音量上调键重启