Booster not pairing with router

[DerekR2]

Despite following all suggested methods, my SE210 flatly refuses to connect with my SR203 router. 

I'm  now on full fibre 150.

Any assistance  would be greatfully received.

[Me134]

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@DerekR2 wrote:

Despite following all suggested methods, my SE210 flatly refuses to connect with my SR203 router. 

I'm  now on full fibre 150.

Any assistance  would be greatfully received.

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Have you tried pairing them initially in the same room?

[DerekR2 · Accepted solution]

Yes;

I've sat them next to each other, moved them 2 -6 ft apart,successfully connected them with an ethernet cable in the hope it remembers,

but within 30 seconds of disconnecting the cable out goes the connected light.