Confused... topic

I have an att version of this device with boot loader 3.16, software version 1.58.502.1

HTC Dev unlocked bootloader, rooted, S-Off.

I'm confused about which firmware I need to flash in order to change to the dev edition.

I see different instructions, some say no firmware update needed, others list various ones (flash 2.22, then a later one, etc.

Any updates guides or instructions on this?

Thanks,

Dan