Hi, can you turn off the accelerator manually in the dsl-ax82u menu like dsl-ac68u? In future updatesInstruction for flashing the firmware.
1. Download the latest image for your model from here. Please download the .trx for DSL-AC68U or the .w for DSL-AX82U.
2. Open http://router.asus.com/Advanced_FirmwareUpgrade_Content.asp in your browser and upload the image
3. Please reset to factory if you are upgrading from stock or 384 release.
In case you want to revert back to stock firmware. Please download the .trx or .w image from the asus website/support page/your router
And repeat the points 2 and 3.
Enjoy!