@Yead No, you're not allowed to upload a FW release for a different HW version on your device:

@MVH10 It would've been helpful if you've mentioned what is the PLC model in question. Click on the arrow in this FAQ and check if your device model is listed there: The tpPLC utility works either...

@MVH10 Have you tried to add the tpPLC utility to add the new powerline adapters - here. While AV600 and AV1000 are compatible you should bear in mind the overall Powerline rate will adaopt the...

@sm_sm This is a service provider modem router and TP-Link doesn't support its FW. Its FW is customized for ISPs. Search for the settings you posted (old green GUI) or here (new logo GUI): and make...

@Clinicamatiz While waiting for a fix why don't you try the previous FW release - Archer C5400X(EU)_V1_1.1.5 Build 20230906

@Eileen21 If you forgot your wireless router administrative password you should reset the device by its reset button and reconfigure from scratch - details. If you have a different product you may...