Software update: T-Mobile G2x V21y

As of April 23, T-Mobile and LG have started the Over-The-Air (OTA) update for the G2x to P999-V21y. The OTA software will be available until May 14. The update to P999-V21e for the G2x will be available on LG's website until May 14. The software P999-V21y will be available on LG's website starting May 14.

You can update in two ways:

Over the air (OTA) update: T-Mobile will push the update to your device sometime between 4/23 and 5/14. We cannot expedite how soon we send the OTA to individuals.
Manual update: If you do not want to wait for the OTA, you can update through LG's website beginning 5/14. See the steps for Manual update from LG below.

來源：http://support.t-mobile.com/docs/DOC-2362