Do someone knows what is CMOS

Your friend suggest to upgrade your nonvolatile BIOS(CMOS). BIOS, in computing, stands for Basic Input/Output System also incorrectly known as Basic Integrated Operating System. BIOS refers to the software code run by a computer when first powered on. The primary function of the BIOS is to prepare the machine so other software programs stored on various media (such as hard drives, floppies, and CDs) can load, execute, and assume control of the computer. This process is known as booting up. BIOS can also be said to be a coded program embedded on a chip that recognises and controls various devices that make up the computer. The term BIOS is specific to personal computer vendors. Among other classes of computers, the generic terms boot monitor, boot loader or boot ROM are commonly used. The vast majority of PC motherboard suppliers license a BIOS "core", and toolkit from a commercial third party, which creates and maintains such a core. The motherboard manufacturer then customizes this BIOS to suit its own hardware - for this reason updated BIOSes are normally obtained directly from the motherboard manufacturer. so check new update of your BIOS configurating and Update your PC with this new BIOS and hope your problem will be solved. But be carefull! wrong installation will lost your BIOS data.

your friend was suggesting to upgrade your BIOS . if a new firmware version is available then you can flash it . if the BIOS chip is to be replaced then contact the dealer to send service engineer