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enter image description here

Do you protonate the oxygen first?

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    $\begingroup$ The dihydrofuran is an enol ether. You should try protonating it as if it were an enolate/enol to make a oxocarbenium ion first. $\endgroup$ – Zhe Feb 18 '18 at 3:04
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I think the mechanism will be something like this,
enter image description here

In first step the hydrogen attached to $C_2$ as the carbocation on $C_1$ is more stable.

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