Default archos 97 carbon GREY WIFI

hey everyone, i have got a problem with my wifi, i can connect to it but it has grey bars and it says cannot connect to internet on web browser (stock) my tab can connect to other wifi but not mine, i tried looking and changing at wifi router settings from laptop but doesnt work. My tab is rooted and i have tried clearing host file and deleting cache of google apps. what can i do without buying a new wifi router ?

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