Is this process workable to from AT&T to DEV version of M8? topic

So I was browsing the HTC website and came upon this webpage with various ROMs for the HTC m8 and others:
http://www.htc.com/us/support/rom-do....html#unlocked

I have an AT&T Unlocked Bootloader and rooted M8 but it's still S-ON.
Can I basically change the CID to the DEV version and then flash this rom/RUU over the M8 to get the developer version?
http://www.htc.com/us/support/htc-one-m8/news/