The new update for 1.17 making me some problem I want to downgrade(not the runtime sdk) back to version 1.16 is there any way to do so (My screen running very slow on web vr)

I developed for the oculus web vr for a while and all worked just fined. (around Jan 2017) then I moved to other project. And now trying to set up a demo again . butnone of the browser (chromium / firefox nightly ) does not showing the image from the...