It is to brush and write the motherboard control chip, and its functions include startup sequence, date and time, voltage control, etc. Not as mysterious as you think. The principle is the same as making a system for a computer. The usage of this action is very small. For example, your motherboard needs a new processor, and the slot supports BIOSS, which can be solved by refreshing this software, or the computer can't be turned on because of the loss of software. It can be said that this action is only needed, and it is almost unnecessary. The old motherboard was downloaded from official website according to the model and then completed under DOS. There will be some differences according to different methods of manufacturers. Now many new boards have their own update functions under the system. Having said that, if the landlord is still interested, please consult an expert and type by hand. If it helps you, please adopt it.