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Before 2021, the H2640 had a reputation for spontaneous reboots under moderate load. The culprit? A memory leak in the old 3.10.x Linux kernel and a flawed Wi-Fi driver for the chipset.
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If your device is an unlocked retail version, firmware bins must be uploaded via Management & Diagnosis > System Management > Software Upgrade . zte h2640 firmware 2021
If your ISP provides a firmware file, you can upload it directly.
ZTE has since removed the 2021 files from their public FTP to push newer (and arguably less stable) 2023 builds. However, the Internet Archive and several OpenWrt forums have preserved them.
Early iterations of Wi-Fi 6 routers often suffered from poor band-steering, causing devices to randomly drop off the faster 5 GHz frequency. The 2021 software updates stabilized Multi-User Multiple-Input Multiple-Output (MU-MIMO) data streams, ensuring dozens of smart devices could connect concurrently without degrading network throughput. 2. Enhanced Security Patches This public link is valid for 7 days
Fixes addressing bugs that previously caused smart TVs and consoles to lose connectivity. How to Check Your Current Firmware Version
During 2021, Wi-Fi 6 adoption was scaling rapidly. Early firmware versions for the H2640 focused heavily on:
Occasionally, applying a major firmware update like the 2021 release can cause configuration conflicts with older settings stored in the router's non-volatile memory (NVRAM). If you experience anomalies after an update, follow these optimization steps. Perform a Factory Reset Can’t copy the link right now
Warning: Never power off the router or disconnect the power cable during a firmware flash. Doing so will brick the flash memory, rendering the router permanently unusable. Troubleshooting Common 2021 Firmware Issues
Clear your browser cache and cookies, or access the gateway using an Incognito/Private browsing window. Reduced Speeds on the 5 GHz Band