What does it means ue-CategoryDL-v1260, ue-CategoryDL-v1330 and ue-CategoryDL-v1450?

Devices
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Hi All.

What does it means ue-CategoryDL-v1260, ue-CategoryDL-v1330 and ue-CategoryDL-v1450?

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Backward compatibility in case the network does not support newer releases