Hello,

Sorry to hear that, while we are afraid that there is not much we can do cause we are not familiar with the 3rd party firmware.

Besides, please read the statement "To Use Third Party Firmware In TP-Link Products", in other word, we are not able to offer a warranty.

https://www.tp-link.com/support/download/archer-c50/#Firmware

But you can confirm whether you can flash the original firmware back.

Wish you good luck, and have a nice day. 

Hi,

Sorry we do not understand French, we tried to translate it into English.

From the picture you sent, the internet led is orange, that means there is no internet. 

If you can login to the web page, you can configure it with the configuration parameters. If not, you can hard reset it to give it a go.

If still the same, I'm afraid that there is nothing we can do, the device may be faulty.

Good day.