3g Moto Xoom - how do I get 4g? topic

I bought the Moto Xoom from Verizon when it launched and never got around to sending it in for the upgrade. At the time our market was 3g and I was in no hurry but we were upgraded last year to 4g so I was hoping to get it done. How would I go about getting it upgraded to 4G LTE now? Done a quick search and didn't see anything.

Thanks!