[Solved] Boot USB on B50-10 Lenovo

Source: https://support.lenovo.com/it/en/solutions/ht500207

Step 1 Change BIOS Setting

1. Enter BIOS, open the Exit Menu. Set OS Optimized Defaults as Other OS. Or go to the Boot tab. Set the Boot Mode to Legacy Support, then set USB Boot to Enabled.
   
   
   
   
    
2. Press F9 (Fn+F9) to Load Default Settings, then press F10 (Fn+F10) to save the BIOS.
   
   
   
   
    

Step 2 Enter Boot Menu by Function Key or Novo Button.

Option 1: Plug in Windows 7 bootable USB disk (USB Stick). Restart PC, press F12 (Fn+F12) to boot from USB disk.




  Option 2:

1. Plug in Windows 7 bootable USB disk (USB Stick). Shut down the machine first, then press Novo Button;
   Notice: Novo button enables PC to power on and go straight into Boot mode.
   
   
2. Choose Boot Menu, select boot from USB disk.
   
   

The steps have been completed. Booting from USB drive for reinstalling Windows 7 should have been enabled.