how to install slow ring from the fast ring without installing windows 8.1 again

[WPCentral Question]

i installed windows 10 fast preview in my 720 phone but the phone hangs regularly so now i want to install the slow ring to my phone. is there any possible to install directly from fast ring to slow ring

 

[Mark Kaplan]

i installed windows 10 fast preview in my 720 phone but the phone hangs regularly so now i want to install the slow ring to my phone. is there any possible to install directly from fast ring to slow ring

You would have to use the Windows Device Recovery Tool to load the original OS, then join the slow ring when you install and run the app.