EA6500 manually select speed and duplex for WAN port

Is there any way (hidden settings?) to manually select speed or duplex for WAN port on EA6500? I'm using EA6500 with Genexis HRG1044 (FTTH) and the latter has known issues with upload speed when local device is connected on gigabit. It seems that both EA6500 and Genexis HRG1044 only support autonegotiation and that always results in gigabit which results in poor upload speeds over the internet. Placing 100 Mbps switch between EA6500 and Genexis HRG1044 does the trick but I was wondering if it can be done without it. BTW, my internet speed is only 100/100 Mbps anyways.
Solved!
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@discoHR If you don't mind me asking, for what purpose do you want to adjust the speed on the WAN port of the EA6500? Is it to increase the upload speed? I'm just spitballing, but I don't think there's any "hidden setting" to adjust it on the EA6500.

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Here you go my friend :)
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hello
when you have speed and duplex set manualy would this stop the negotiation with the other site ?

thank you for the reply
i had the folowing problem which is solved
router with manual setting speed 100, duplex full
conected to an uknown switch witth increasing input errors.
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speed and auto duplex got the same settings 100 full duplex but errors disapeared
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and from here comes my question would be by setting the ethernet to manual will disable nogatiations ?

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EA6500 manually select speed and duplex for WAN port

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