recover出现问题 叔叔在哪里，求帮助

1989716

进入recover模式显示如下：
     android system recover(3e)
     android system recover utility
    reboot system now
    appiy update from sdcard
    apply update from cache
    wipe data/factory reset
    wipe cache partition
    backup user data
    restore user data

  E:failed to open/sdcard/update.zip(no such file or directory)
   E:signature verification failed
进入recover就显示这个，求高手指教该如何解决。。。。