This repository is a community-driven firmware modification and documentation project for GPON SFP ONU (Optical Network Unit) modules based on the Realtek RTL960x chipset, specifically models like VSOL V2801F, TWCGPON657, DFP-34X-2C2, and UF-Instant. It provides modified firmware images, boot-time configuration scripts, emulation tools, and monitoring utilities. The core functionality includes: (1) firmware extraction, modification, and repacking using scripts like qemu-test.sh and binwalk; (2) device-specific workarounds for 2.5GbE speed, VLAN forwarding, and OMCI compatibility injected via init.d scripts (rc22, rc35); (3) a Prometheus exporter (Kitamon) that scrapes the ONU web interface to expose operational metrics; and (4) extensive documentation on OMCI parameters, flash settings, and ISP-specific configurations. The repository is a hybrid of embedded firmware engineering and community documentation, with the dominant character being a toolset for modifying and managing GPON SFP sticks. It is not a standalone application but rather a collection of reusable scripts, firmware archives, and reference guides targeting hardware hackers and network engineers.