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Some firmware versions intentionally restrict features at ISP request:

: If your B660 is stuck on 2G, it might be due to a regional firmware lock. Flashing a generic global firmware can sometimes resolve this.

: Most Huawei firmware packages for this era use a tool called FMC Upgrade . Once you’ve downloaded the correct firmware file for your specific model ( , etc.), run the tool and click "Check" to begin the sync.

Always perform a configuration backup before any firmware change.

Software & Firmware Download of Enterprise Products - Huawei

This guide provides an overview of the firmware for the Huawei B660 3G Router