“Unlocked” or “Third-party” firmware. The ZTE F680 uses a proprietary Realtek or Broadcom chipset; OpenWrt/DD-WRT is not available for this model.
Most ISPs manage the ZTE F680 remotely via (a protocol for auto-configuration). In 90% of cases, you do not need to update manually.
If the automated check does not find a new version or if you have downloaded a specific firmware file from the ZTE Technical Support website, you can perform a manual update.
⚠️ : Firmware updates are usually provided by your ISP , not directly from ZTE for end users. The wrong firmware can brick the device. Proceed only if you have the correct file from your ISP or a trusted source.
Updating a modem is not as simple as updating a smartphone app. If the process is interrupted, the device could become "bricked" (permanently damaged). Follow these preparatory steps to ensure a smooth process.