Why is it called "USLoader"? Because you can use it as a for devices without Wi-Fi (e.g., Raspberry Pi, old desktop PC, or an industrial controller).
Modern Huawei modems, including the E5577, run on the Balong chipset architecture. By default, the device operates in a "Production Mode." In this state, the OS is locked down. You cannot flash generic firmware, you cannot change the SIM lock status, and you certainly cannot recover the device if the primary partition table becomes corrupted. usbloader e5577cs603 portable
