I have read a statement from Manoj before that switching from ‘stable’ to ‘dev’ is not supported, thats my memory on that.
Since I wanted to see myself how that experience might be, I backed up and went for it. Really hoping it would work since setting up a new device would have been a pain (I have just done that a couple of months before)
Here is how I did it:
I did not experience any issues with the switch since then, apps (mostly banking) which didn’t work on R ‘stable’ worked with T ‘dev’.