Zaid, I know how exciting getting new software can be. We do not have information on when and if the newest software will become available for any device. This includes the Upgrade assistant. You can always check for available software by following the link: http://vz.to/1mYEqey
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But haven't the marshmallow update for the lg g3 been available ota since february how come it still shows my phone as "up to date"using the upgrade tool?