1. COM interface, also known as serial port, is connected to the back of desktop computers and is currently being phased out. The advantage is that the price is low and it supports flashing (some mobile phones can only use serial cable flashing); The disadvantage is that it is extremely inconvenient to remove and unplug, does not support laptops, and the transmission speed is also relatively slow

2. USB interface is currently the mainstream, with the advantage of being convenient, fast, and stable, supporting all models of computers; The disadvantage is that the price with IC is slightly higher, and some data cables do not support the flash function