This script simply copies the current pose of an armature to a target armature and applies it as the REST POSE.
It uses COPY_TRANSFORMS constraint and after completing the job It REMOVES all of the COPY_TRANSFORMS constraints on the target armature.
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Simply install the .py file by using the addon panel in Blender.
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Place the target armature into collection named "TargetArmature"
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Select ONLY the Rig you want to change it's rest pose and run the script or call the operator named "CopyPose to RestPose"
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