No idea if this is relevant or not but the Asus router app does not find a new firmware version
Usually, it takes time for the firmware to propagate (replicate) to the ASUS download servers throughout the world, hopefully your will be ready in a day or so 
Edit: just noticed Version 3.0.0.4.386.49674 download link no longer works so looks like firmware has been pulled hence maybe why your DSL-AX82U app is not picking up latest release ?
In a completely sane world, madness is the only freedom (J.G.Ballard).
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