Desde que descargue el ios8 en un 4s no tengo wifi

he tenido una buena experiencia en los iphone pero desde que descargue el ios8 en un 4s no puedo activar el wifi y me urge

Tengo el siguiente problema: se trata de un Lenovo B590 en el que no se sabe la contraseña de inicio del windows 8 que tiene instalado. No es posible entrar a la BIOS ya que al parecer esta activada la opción Secure boot y ninguna tecla obedece en el arraque para entrar en la Bios, forzar el arraque desde Cd o cualquier otra opción. Agradecería sugerencias.  Saludos

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