Starting post has been updated with new infos about the failure of "Enable features application" in recent firmwares.
For more infos look [Only registered and activated users can see links. ]
As usual :
Before converting make your unit files backup and NV backup.
Please read post n1 and follow it with care step by step ,or you can brick your device.
Finally : if you don't know what you are doing .. just don't do it !