You need the FC_Serial_Driver and Huawei_Mobile_Connect_Driver installed so your PC recognizes the device as a COM port.
Before attempting any advanced modifications, ensure your hardware matches these standard specs: 4G LTE FDD/TDD, 3G DC-HSPA+/UMTS. Battery: 1500 mAh (approx. 6 hours of active use).
The specific binary file required for the E5577 series (Balong V7R11 chipset) to initialize the flashing environment.