My insulation mat under the carpet is in fairly good shape,it has a few cracks in it which are easily fixed,problem is that the edges have curled up 2 to 3 inchs around the edges.
Can it be returned to flat or is it this way forever ?,TIA

Try a piece of felt and an iron.

Thanks Mark,have some felt ,whats an iron ? .

Interested to know if this works.

"Cracks easily fixed"..... how??

I plan to use a Sika black body sealer to fill the cracks,I have used this product to repair weatherstrips and other rubber parts ,very good product for this application.
Will report back on results.