Motorola will finally make a 4G LTE upgrade available to owners of its XOOM tablet beginning in September. The tablet ships with an embedded EV-DO modem for 3G connectivity on Verizon Wireless’ network out of the box, but Motorola had promised that an upgrade to 4G LTE would become available this past May. Motorola has not been clear on the cause of the delay, but the company began sending emails to XOOM owners telling them to expect the update in September. Applying the 4G LTE upgrade requires that a new modem replace the old one in the XOOM, and Motorola will need customers to ship their tablets out for up to a week in order to have the upgrade applied. The process will be free of charge for XOOM owners.