When I refer to “beta” henceforth, I wont be using the old terminology of calling W versions as Beta. Both W and X version code have beta versions. They are in beta because the theoretical possibility of them causing bootloops after kernel flashes cannot be ruled out.
The beta code will be referred to with the suffix E. So, the beta of W version is WE, that of X is XE.
To convert X version to XE, flash the XE Reinstaller. If you need to use this code righ after a fresh rom install, use the corresponding Installers. (For more instructions read the Install page)
The flashable zips can be downloaded here.