Always back up your current configuration settings before starting the upgrade. Step-by-Step Update Guide Access the Management Interface Connect your computer to the via an Ethernet cable.
After the ONT reboots, perform these checks:
1 x 10/100/1000Base-T Gigabit Ethernet port.
| Issue | Likely fix | |-------|-------------| | ONT reboots every few minutes | Upgrade from P2T1 to P6T1 | | Can’t set custom VLAN | Need ISP-specific firmware | | Web interface slow or missing | Downgrade to stable version (if allowed) | | OMCI connection fails | Firmware mismatch with OLT (check compatibility) |
To safely downgrade:
Navigate to: or System Info . Look for:
For many users, the primary goal of upgrading or customizing F601 firmware is to use it in . This turns off the F601’s internal routing and allows a third-party router (like an ASUS or Ubiquiti) to handle authentication (PPPoE/DHCP) and network management. Access the Web UI and log in. Navigate to Network -> WAN -> WAN Connection . Create a New Connection and set the type to Bridge . Enable VLAN Tagging if required by your ISP. Disable DHCP Server on the LAN settings. Reboot the F601. 5. Troubleshooting Common F601 Firmware Issues
Are you looking to for a specific ISP compatibility issue, or are you trying to gain Telnet/Root access ? ZTE F601 - Hack GPON
Locate the or Firmware Update section under system tools. Click Browse and select your downloaded firmware file.
Older firmware versions contain known vulnerabilities in the web management portal, leaving the device exposed to malicious local network exploits.
Linux-based custom ONT operating system.
If your unit is ISP-locked, it will only update when the ISP pushes a new configuration, usually during the nightly maintenance window. 6. Security Warnings for 2026
If your ONT web interface is accessible, this is the safest and easiest method to update the firmware. Step 1: Connect to the ONT
Supports up to 2.488 Gbps downstream and 1.244 Gbps upstream.