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Although android pie 9.0 has been rolled out for LG V30, however our AT&T model "H931" isn't supported yet. Only models for European countries (H930) are being updated at the time. Also it isn't the network carrier's fault even though they have the package to update the phone, it needs the clearance of LG to roll them out to the customers.
Here is a link indicating that we are still on Oreo 8.0 (click on previous updates)