Tell me how flashing can damage the motherboard

Personally, I think that if the flash operation is normal, the hardware should not be damaged. If you disconnect the data cable or shut down the computer before the flash is completed, the hardware may be damaged, just like a USB flash drive is reading. Or if you force it to be pulled out when writing data, it may break. Now there is nothing you can do about this situation. In fact, after-sales service personnel are not very good people, they are just ordinary technicians. I have a friend who works as an after-sales service person for a certain brand. When something is repaired, it is originally a software problem. If you intentionally short-circuit the power and burn out the hardware, you can charge a fee and get a commission, but people will not admit it. It is very dark. Anyway, your hardware must be broken now. Even if it is originally good, it will be damaged. Pay for the repair and don't flash the phone yourself in the future