@Sunshine My friend pointed me here to tell TP-Link how to fix upload speed issue for GPON SFPs https://github.com/Anime4000/RTL960x/issues/235#issuecomment-1878263773

@Sunshine Yes. Still same 2.4Gbps backhaul speed. So I cannot confirm if it is a cosmetic error on Web GUI. Download speed reaches 1040 Mbps but upload speed is poor. Around 300 Mbps. Same issue on...

@Sunshine After installing the debug firmware sent via email and passing the debug commands from previous page, I am happy to report that both ODI DFP-34X-2C2 and Lu Leey 2.5G GPON sticks work...

@Sunshine Here is the screenshot of Ethernet Link speed. Where it says 2.4Gbps wired. Here is a reply from official TP-Link USA support regarding backhaul and 6Ghz mesh

@Sunshine I just updated to V1.1.3 firmware released for BE900 All the problems remain. The ethernet backhaul link speed says 2.4Gbps. However, it is actually the link speed for 2x2 Wifi6/6e. So what...

@Sunshine I got an email reply from tp-link customer care that BE900 does not support Ethernet Backhaul "Yet" and they asked me to keep an eye on firmware update page.. which I am keeping an eye on...