nazmiuyar wrote Why isn't there any similar application in such a device? @nazmiuyar I wouldn't know why TP-Link doesn't offer true SQM as an option. Maybe they are afraid of the performance...

@Akkum There are TFTP guides for TP-Link routers on Youtube. You might want to check there. By the way, he computer running tftdp must have a static IP address of 192.168.0.66

@Akkum Perhaps go through this thread: https://forum.openwrt.org/t/restoring-stock-firmware-for-archer-c50-v4/63773

@Akkum Hi, What is the region code of your Archer C50 V4? Edit: I just noticed you already mentioned it's "EU". There is more than one firmware listed here...

@nazmiuyar Hi, Are you sure the GE550 supports SQM (i.e. Smart Queue Management)? Is there any mention of it in the GE550? In case you were talking about the traffic prioritization QoS, then yes,...

@GQ52 Good to hear that you've got it working in the end! Judging from other user's posts here, it seems not that seldom that people are being sold devices that already come with a password set....