LG Leon won't update to 5.1.1 on Metro PCS

Hi guys, so I recently got an LG Leon to replace my L70 and have been liking it so far except for one major thing, I can't update from 5.0.2 to 5.1.1. When I do try to update, it will reboot and all that and begin installing, but then the little android dude will fall over and have just the text "error" at the bottom of the screen and then force me to pull the battery to turn the phone off.

Anyone know how to fix this?