I had kept my avatar the same for some time now with some cool galaxy skin colour and some customisation options not available in the new Rift 2.0 Mirror editor. A friend of mine tried out VR and trashed my home and changed my skin while I wasn't looking.
Long story short, I have no idea how to access the old avatar editor anymore, and can only find this stupid mirror thing that you can place down in your home and has very limited options for customisation. Looking online all guides from official Oculus support say to go to your profile in the top right, which is clearly talking about the old interface.
The closest thing I can find to the editor is to go into the Oculus folder Oculus/Support/oculus-avatar-editor and run OVRAvatarEditor.exe, which works and actually does load my old character unchanged from when my friend edited it, but it doesn't save it to my home or anything else once I leave the app.
Has customisation been severely limited and replaced by only this Mirror thing? Is it possible to get the old avatar customisation options back which had a lot more options? I remember using the avatar editor in Rift 2.0's interface about a month or 2 ago so I don't know why it's gone now.