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This is where most top custom firmware originates. Look for threads titled "Huawei B311221 firmware unlock." Use a translator. Always scan downloaded files with VirusTotal.
If your SIM plan restricts "tethering" (e.g., a phone plan in a router), the unlocked firmware allows you to modify TTL (Time To Live) values. Set TTL to 64 or 65, and your carrier sees the traffic as coming from a phone, not a router. huawei b311221 unlock firmware top