The Developer Preview, which is an OS update not firmware update, for Windows Phone is the same for all devices - HTC, Lumia, Samsung, etc.
As the Developer Preview is primarily for developers, there can be small issues but generally the releases have been very stable so far.
Typically, when you have a newer build of the OS installed, via the Developer Preview programme, you won't get the official release as you'll always be ahead of it. The firmware updates are different, and are released by the manufacturer.
If for some reason you want to back to the official release, you'll have to re-flash your device back to factory restore version. That would require a restore tools such as the Lumia Software Recovery Tool, which is for Lumia devices only.