|
You need a wifi extender that operates in “bridge” mode - you set it up to connect to the existing router via wifi and then can use its RJ45 socket to connect to your Three extender.
Something like this would do the trick...
TP-Link RE200 AC750 Universal Dual Band Range Extender, Broadband/Wi-Fi Extender, Wi-Fi Booster/Hotspot with Ethernet Port, Plug and Play, Smart Signal Indicator, UK Plug https://www.amazon.co.uk/dp/B00KVD6CJY/ref=cm_sw_r_cp_api_i_Kg9EDbC56B68Q |
|