I have an AT&T unlocked LG-G3 running on T-Mobile. When I search for updates it says that it's up to date even though i'm only on 4.4.2. When I open up the Software update tab where it shows update history, it says 'last update: not updated'. It seems like I should be able to find the update but my phone can't for whatever reason. Anyone have a solution?
Welcome to the forums!
It is because you are running an AT&T phone on T-Mobile. You need the AT&T update.
You can buy a prepaid card insert it, boot up and check, borrow a friend's AT&T card and do the same or you can go to Best Buy and have the Samsung counter flash the update.
I don't know if you can find it on Kies or not. You can also get the update and download and install with Odin, someone else might can help you with that.
If you are near a Best Buy, I would just take it and let them flash the update, they do it for free.