A B311-221 bought from a carrier (EE, Vodafone, Telstra) is often feature-crippled compared to an "open" model from Amazon or AliExpress. The Security Gap: Backdoor Debug Interfaces Huawei routers have a well-documented "hidden" backdoor—though calling it a backdoor is dramatic; it's an undocumented debug interface.
Disclaimer: Modifying your router’s firmware may void warranty, violate your ISP’s terms of service, or brick the device. This post is for educational purposes. Proceed at your own risk. huawei b311-221 firmware
| Variant | Lockdown Level | Hidden Features | |-------------------|---------------|--------------------------------------------| | | Low | Full band selection, TR069 can be disabled | | UK (EE/Three) | Medium | Custom APN lock, no bridge mode | | Australia (Telstra) | High | Forced TR069, no band locking, custom DNS hijack | | Asia (Globe/Smart) | Medium | SMS over web UI removed, battery disabled | A B311-221 bought from a carrier (EE, Vodafone,
iptables -t mangle -I POSTROUTING -o wwan0 -j TTL --ttl-set 65 iptables -t mangle -I PREROUTING -i wwan0 -j TTL --ttl-set 65 Save it with iptables-save > /etc/iptables.rules . Edit /etc/dnsmasq.conf : This post is for educational purposes