Re: Upgrading a player in NBA live mobile

@dog-r-me 

We'll try to get out to you faster next time around but if you ever need immediate help with our Support team during limited-time events, don't hesitate to open up a case via in-game. Here's how to do that.

Were you eventually able to swap him out and share what worked? Usually with errors like this a restart of the device and game helps. If you have your game synced up to Facebook/Google/Apple accounts you can safely delete the game and reinstall it without losing progress.

iOS

https://help.ea.com/en-us/help/mobile/troubleshooting-steps-for-ios-apps/

Android

https://help.ea.com/en-us/help/mobile/troubleshooting-steps-for-android/