Dear @Kambo
I have sent the latest firmware to you.
What is the type of your ethernet? Is it RTL8125?
If yes, please follow the steps to try in this topic.
Modem Quectel RM520N-GL: Ethernet PDU support with WaveShare 5G M.2 TO Gigabit ETH support - IoT Modules / 5G Module - Quectel Forums