This is the software that comes from the factory.
In 2023, security researchers found a backdoor in several popular 4G router models that allowed hackers to inject malicious DNS settings. The fix? A firmware patch. If you do not update, your banking traffic could be routed through a server in Russia without your knowledge. Vulnerabilities in web interfaces (like CVE-2021-32557) are discovered monthly. 4g lte wifi modem firmware
Some advanced users flash OpenWrt, DD-WRT, or custom LTE firmware to unlock features like band locking, TTL manipulation, or full router functionality. Warning: This usually voids the warranty, can permanently damage the modem, and may not support all LTE bands. Only recommended for experienced users. This is the software that comes from the factory
You might ask, "Why bother with 4G LTE firmware when 5G is here?" Because 5G coverage is still patchy, and 4G networks are denser and more stable. In fact, the latest 4G LTE wifi modem firmware now includes "5G NSA (Non-Standalone) bridge mode" – allowing your 4G modem to act as a fallback anchor for a 5G router when mid-band 5G is unavailable. A firmware patch
Furthermore, firmware developers are adding advanced features like multi-WAN bonding (Sending traffic over two separate 4G SIMs simultaneously) and low-latency QoS for gaming.