Neopop How to link up

Hello!

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I am playing for the moment SNK Vs Capcom Card Fighters Clash on the Neopop and wanted to link it to another Neopop instance however I am unable to do so.

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Every time I connect them, in the game there is an error message that appears.

What should I configure to make them work.

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Both instances on English, with different saves.

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Any help will be greatly appreciated.