@Klaus123 I see, thanks for your reply. You can use the previous extender to broadcast a new wifi network with new password. If need more help, just let us know.

@maestrosg Definitely sure. You can keep in touch with our engineer.

@Ismail_Hossain For 2.4GHz, channel 1, 6 and 11 are recommended, you can try them first; for the channel width, you can use 20MHz. May it help.

@Neel Hi Neel, it seems that the local official website has not uploaded the latest firmware. You can click https://www.tp-link.com/en/support/download/archer-c6/#Firmware to get the right one. May...

@Fabioturf As far as I know, there is no option to check the CPU usage of the TL-WR840N. To verify the number of hosts connected to the wifi, you can login to the web UI and go to DHCP-DHCP client...

@Thomas_Cad What is the led status of the TL-WR841N? Especially the internet led. After you got the new internet connection, have you ever reconfigured the TL-WR841N with the username and password...