Save/export an uv layer ?

Hello, I lost some time unwrapping a model and I see I modified another uv layer unintentionally.
I there a function or script to restore just this layer from an older version of my model ?

Thanks

Append in an old version of your model and then copy the uv layout over from this (blender 2.5x) - see screenshot.
You could alos append the mesh data (whicj holds the uv layout) from an old version and swap your existing mesh datablock with the old one.

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OK, thank you, it works… unfortunately I changed some vertices between the 2 versions, shame on me !