Using the Huawei flasher tool:

Official firmware updates for the Huawei B311-221 are typically released to fix security vulnerabilities or improve LTE and Wi-Fi performance. Query the software version | HUAWEI Support Global

Note: This method is considered "cold" now, but many old stock routers still work.

I can provide the exact or link structural steps for your specific version. Share public link

Before you begin, it is crucial to understand the risks and prepare accordingly.

Below is a complete guide covering the risks, methods, and best practices for unlocking the Huawei B311-221.

A USB-to-TTL serial adapter (PL2303 or FTDI) if your specific sub-model requires hardware-level bootpin shorting.

This is the most straightforward and safest method as it does not require flashing any software.

Unlocking a router you own is legal in most countries (e.g., US DMCA exemptions, EU Copyright Directive). However, may violate your terms of service with the original carrier. Do not change the IMEI – that is illegal in many jurisdictions.

Unlocked routers sell for more money on sites like eBay. Method 1: The Official Unlock Code (Safest Way)

There are three primary ways to unlock this router, depending on your technical comfort level and current firmware version: