You entered the wrong code, or the device is on a newer algorithm (V3 vs V2). Solution:
Unlocking Huawei devices is not always as simple as entering a code. The Huawei E5573s-856 has been manufactured with different "Algorithms" (or "Algos") over the years. Huawei E5573s-856 Unlock All Network
: Your device should now show a signal from the new carrier. Method 2: Firmware Flash (For Restricted Devices) You entered the wrong code, or the device