Bios protection from infection with virus or bios recovery of Lenovo Thinkpad Edge e545

I have Lenovo Thinkpad Edge e545 laptop. Among downloads there are no bios images but only backup cd iso file. Does laptop bios somehow protected from beeing infected with virus when OS installed on laptop is infected? If not, is there a way to recover bios from usb flash? Or is there some other way to recover already infected bios without help of technical support center?  

Dear Wyacheslav1
Welcome in lenovo community
Actually there is no relationship between the Virus and the BIOS also the BIOS cannot be infected such as the windows . So if you have any debut that your machine has been attacked by a Virus, you can install any antivirus application to scan for this virus and to protect the machine from such attack 
Thanks
Alaa

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