On a standard day, your Huawei phone connects to a PC via standard Android ADB or MTP drivers. However, when the software is corrupted, the screen is broken, or you're locked out, the device can enter a specialized low-level state known as "Huawei USB COM 1.0" mode, also referred to as COM 1.0 mode or manufacture mode. This mode operates over a virtual COM (Serial) port, which is different from the usual connection methods.
Several tools can communicate through the COM 1.0 port to reset FRP locks. Here are some of the most notable: huawei usb com 1.0 frp tool