Mention it in the comments below and the community may help locate the correct firmware.
Firmware acts as the operating system for your router. Version 5.2 (and its sub-versions like V5.2.10P6T6) generally signifies a major update for the F609 series. These updates often include: Firmware Zte F609 V5.2 Download
: Do not turn off the router during the update process, as this can permanently "brick" the device. Risks of Unofficial Downloads Mention it in the comments below and the
The Role of Firmware in GPON Networking: Focus on ZTE F609 V5.2 Firmware Zte F609 V5.2 Download