@woozle Thanks for the response. when I try to upgrade , I get this error : Failed to update the firmware. Please check the configuration file and try again regards

@Marvin_S thanks for the answer. 1- with firmware C6(EU)_V4_1.13.6 installed , I've done a factory reset . the result has been the same : loopback doesn't work. 2- you suggest downgrading firmware...

Since I updated firmware to Archer C6(EU)_V4_1.13.6 Build 240430 version , the loopback doesnt work well. I can not access to my home server using the ddns address. Sometimes it works during some...