The code is a part of your motherboard. Depending on the motherboard you have different methods of updating the bios. Of course, the scary part is if you do not finish the update, or if your bios chip fails, your PC will brick itself.
Every motherboard uses different means to do this update. Some require you to download the bios to a flash drive, plugged into the USB port, some even have a special port just to update the bios. Some can even be updated with out a CPU installed. Some use a windows program also.
So to answer your question, what motherboard does your computer have.
The issue with the 13/14th gen CPU is that Intel sent the wrong specs to the MB makers, they were told they could handle more voltage then they were actually specced for, and this in turn caused those CPU’s to start overheating, some even to the point they damaged both the CPU and Plug in. The Bios updates lowered the voltage, and it took many updates, but may not reverse the damage already done if any.
Intel extended the warrantee, so if you have a affected CPU and are having issues, then you might be able to RMA it.
The original issue is actually a part of this sticky post:
To add, if your PC is a pre-built, the maker might not have the latest bios available, and you might have to contact them directly. If you are not sure about updating your bios, make sure to read the board manufacturers documentation or find a local technician.