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ISP :

I have set one powerline downstairs next to the router and one upstairs, however it doesnt seem to be utilising the full speed of my broadband.

I have tried to upgrade its firmware but it says firmware failed to upgrade.

here is the powerline I purchased

https://www.amazon.co.uk/gp/product/B01BECPIMC/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1