Windows 10 for Phones will support some 512 MB devices, can have a rollback feature
New details about the first Preview build
A key Microsoft employee posted on Twitter that the upcoming Preview version of Windows 10 for Phones will support some 512 MB smartphones. At the event in January, Belfiore briefly announced that Microsoft will try to upgrade most of the current Windows Phone 8.1 devices. The company is yet to reveal more details on the hardware requirements for getting Windows 10 for phones, but this is the first time we hear about the possibility that old and low-entry smartphones could get the pre-release version along with all models with 1 GB or more RAM in February.
In another tweet, Gabe Aul says that an option to rollback to a previous OS version could be included in the first Preview version for phones in case users encounter serious problems with their devices.
The rollback feature would allow you to remove the Preview and install a fresh official build of Windows Phone 8.1 if you encounter a glitch. If this option comes with the first preview this month, it would encourage more users to jump into the Windows 10 waters. Yesterday, a couple of screenshots leaked online, revealing the improved Settings Menu and Action Center in Windows 10. The public release is expected within two weeks from now.
Source: Gabe Aul at Microsoft