Following that, on Wednesday, the company released an alpha build of the ROM on its forums. The ROM contains no extras beyond the stock features of AOSP Lollipop, and OnePlus intends to build upon, improve, and customise it further with subsequent firmware updates. This ROM will not be available via OTA and can only be downloaded to flash on OnePlus One smartphones (Review | Pictures).
(Also see: Alleged OnePlus One Mini Variant Pictured Alongside Specifications)
On its forum, OnePlus has provided instructions on to install the custom ROM with the advisory to "proceed at your own risk."
Some of the known issues in the released custom ROM noted by the company include:
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