Problema al iniciar Lenovo B50-30 Checking media...

Hola!
Hace tiempo que tengo este Lenovo B50-30 (80ES) que me venía con Windows 8. Lo pasé a Windows 7 de 32bits, lo cual tuve que volver a cambiarlo por el de 64 bits esta mañana. El error viene cuando después de pasarlo al formato de 64 bits que era el indicado, al terminar el formateo todo normal, el fallo comenzó cuando empecé a instalar los Controladores, al intentar instalar "BIOS Update Utility exe" (O al menos pienso que este pudo ser el último que intenté instalar antes del fallo) La cuestión es que la aplicación me pedía que no utilizara la batería para ejecutarla y que conectase el cargador. Hecho esto, comenzó a instalarse hasta que me apareció una pantalla negra con unas letras en rojo, tras cargarse por completo, lo siguiente que apareció fué:
El logo de Lenovo y después una pantalla negra que dice"Checking Media..." Tras esto, una ventana azul que dice:
"Default Boot Device Missing or Boot Failed.
Insert recovery media and hit any key
then select "boot manager" to choose a new boot device or to boot recovery media"
Seguido de la opción [OK], al presionar me lleva a un página de fondo blanco que pone "BOOT MANAGER" debajo; Boot option Menu y solo a poder elegir una opción: "EFI PXE NETWORK", pulso Select y: de nuevo "Checking media..." Solo que ahora en una ventanita azul dice:
"EFI network 0 for IPv4 (F0-76-1C-19-33-D5) boot failed, Y después este mensaje se repite si sigo presionando [OK]
Llegué a deducir por lo de IPv4 que necesitaría conexión a internet, por lo que cunecté el cable al ordenador y esto solo cambió la respuesta del cuadro, supongo que dando otro fallo, pero ninguna otra opción que no sean las que ya he dicho.
La cuestión segun he leido parece fácil de solucionar, pero mi verdadero problema recae en que no puedo acceder a la BIOS de ninguna de las maneras. Mi portatil no tiene ese botón para acceder a la BIOS, supongo que hay que hacerlo mediante F12, aunque los he probado todos, y al salir el Logotipo de Lenovo intento acceder a la BIOS y no me deja.
No sabría deciros si instalé el controlador de la Bios, si era el controlador propio de la Bios el que me ha dado este fallo, no sé. No estan todos los Drivers instalados, ya que este era de los 3 primero que me descargué por orden de la página y me salió el fallo este que no me deja acceder a Windows.
La verdad es que estoy un poco desquiciado con este error, asique agradecería muchiiisimo una ayudita. Y aunque no se supiera solución, otra duda es que si podría Re-formatearlo para solucionar el problema. La cuestión es esa, que no puedo Acceder a la BIOS y no se siquiera si lo podré formatear.
Gracias de antemano por dedicarme unos minutillos
¡Resuelto!
Ir a solución.

Para el caso 2 en el que que modificas la BIOS a legacy el disco duro aparece para el orden de arranque, con esta configuración Windows no carga normalmente verdad? mismo mensaje mostrador desde un inicio, recomendable en la pestaña exit verificar que en las preferencias de sistema operativo, este para Windows 7 en el caso de no estar este parámetro colocar en otros.
Si con esto persiste el mensaje problema, intenta arrancar el instalador de Windows 7 y verificar si el disco duro, para intentar verificar si es que el problema es debido a error en el arranque de Windows o de plano no tienes ningún sistema en disco que arrancar.
Un saludo.
@Antony_Vamu
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Mis Lenovo: Y560p,Z580,Z500 touch,S920,T400,G50-70 ,Soy voluntario no trabajo para Lenovo, las opiniones expresadas por mi no representan a Lenovo, no se responde a preguntas de manera privada debes crear un nuevo tema, números del centro de llamada Lenovo Aquí , reglas de participación del foro Aquí , si encontraste solución a tu problema marcarlo aceptándolo como solucionado!!!!!

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Hello,
Sorry for my english, i'm french.
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Vladpaul,
Welcome to the Forums
As per the query we understood that you are facing issue with BIOS update in your Lenovo B50-70 laptop.
We are checking with our team regarding the BIOS update, we will update once we have an information about the same.
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