Can connect my modem to fiber? Asus DSL-AC52U

Hey all,

having a problem, I cannot connect my Asus DSL-AC52U to my fiber connection at home. im currently using spark hg659b and it is working but the signal is not good. when I try setup my asus modem+router it goes to the quick setup wizard but it does not connect. the wan light goes on but the light with "e" is not coming on? any help is appreciated. thanks
 
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