Tenda P200 connection issues with N300

Apr 2, 2018
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So i've had the tenda p200 and n300a to extend my wifi network to the other part of the apartment for a few years and i've never had and connection problems with the powerline but today the ''house'' light on both devices is off. Thus me having no internet connection. I tried reseting/re-pairing the devices and also tried having them on the same power outlet. Nothing i have tried worked. I tried looking some solutions on different forums but i didnt really understand alot. I dont really know much about routers and networking and i had the p200 and n300 set up by the shop i bought it from.

*Ethernet and Wifi through the main router works flawlessly