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My carrier is T-Mobile. I got a new sim unlocked ATT LM-V405UA which came with V405UA20o firmware and pie on it, there was no VoLTE and Wifi-Calling was grayed out. I called T-Mobile and they told me that it was enabled on my account, but my phone didn't support it. I think if you are sure ATT...

I actually followed your other post here https://forum.xda-developers.com/lg-v40/how-to/guide-lgup-root-t3967858 Crossflashed to US Unloked V405QA7 firmware. I got better reception and Wifi-calling. And no AT&T bloatware. Now I want to root but I am afraid I might brick the phone again.

Did anyone ever get at&t firmware? I have been all over looking for this. Any help would be appreciated,