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Problem to get uwv after retopology

How can I get UWV coordinates after retopology?
If I load low poly mesh with UWV on 1 subdiv, i get a big trouble

export out your new level 1 and unwrap that, make sure
tool>export>grps
is turned off before you export, else it won’t import correctly

to import —
go to subD 1
tool>morph target>store MT (delete MT if store MT is gray)
tool>import
tool>morphtarget>switch
tool>geometry>go up subD’s to make sure it doesn’t explode
tool>geometry>go back to level 1
tool>morphtarget>delete MT

tada

I have unwrap on low poly model, and this unwrap the same as on hi poly model, and if ill get new uwv i shall not able to use diffuse map from hi poly model
It is my main problem

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