This indicates the boot shot was not held cleanly when the power cord was plugged in. Unplug everything and repeat Step 1.
(for stock firmware)
A proper firmware-based unlock remains active even after device resets or future software updates. Key Specs of the Telenor (Globul) Unlock - HUAWEI B311s-220 - DirectUnlocks huawei b311s220 unlock firmware verified
To unlock your Huawei B311s-220, you'll need to update its firmware to a version that allows unlocking. One verified firmware version for unlocking is B311s-220 22.3.1.1.0. This indicates the boot shot was not held