That should be right then and I would expect it to be accepted. That page links to the C50 V6 userguide btw, so indeed another signal they are the same.
What version of the TP-Link firmware are you using? If it is very new, maybe you could see if downgrading is supported? Another option would be the TFTP method as it seems that worked for @NewUse.
I'm also seeing there is a V6.20 listed for the EU model.
Can someone help with that or do I open a new thread? (I am using Fedora Linux 41, a switch between router and pc and the tftp server is the tftp-server package for fedora which should be the equivalent of tftpd-hpa on ubuntu)
all could be done via build-in dnsmask-tftp , first of all try to disable firewall. Then check if ping fedora.tftp returns the IP of your pc, and that this ip is inside 192.168.0.1/24 network
Sorry for the confusion, i ment LTE on my phone. The wifi calling is often distorted, RC4 did not have any problem. The wifi range also seems to be smaller