[Solved] User defined priority qos missing after firmware upgrade on rt-ac750

I was helping my sister with her wifi. She only has a 15/1mbit connection, and everytime one of her kids uploaded a video to snapchat and such, the connection would drop and pings were above 3000.

So I managed to fix it by setting the upload to 40% in the user-defined priority QoS. Then I noticed that a new firmware was available, so I updated the router, and now the user defined priority QoS is gone!

I am able to set the QoS for upload and download but only as mb/s which isn't useful,...

[Solved] User defined priority qos missing after firmware upgrade on rt-ac750