Does bios recovery procedure on motherboard and/or laptop rewrites bios boot block

[Vyacheslav1]

My computers are infected with virus which infects bios.
Yes, i know that for sure. Hackers demostrated my laptop in a state in which it does not detects hard drive for up to 3 reboots, simultaneously commenting situation from other side of my room window. Other old PC bios they broken totally. CMOS CHecksum Error is printed at boot.

My question is: does laptop bios recovery procedures(to be specific: Thinkpad EDGE e545, Acer Aspire 5742G) and motherboard(GA-Z170-HD3 DDR3) rewrites bios boot block? I am asking because hackers are very professional, I think they infect even boot block.

Please provide links to any related documentation or articles if you know the answer to my question.

[Vyacheslav1]

Asus support tells it is impossible to infect bios boot block using software and 0 such cases registered.