OnePlus in China will be holding an event on the 7th April where a new version of the companies Chinese ROM will be unveiled.
OnePlus has two ROMs for its phones. Hydrogen OS is their Chinese ROM with a custom UI and no Google services, while Oxygen is the international version which is pretty close to a stock Android install.
An event being held in Beijing on the 7th April has now been confirmed to be about a new Hydrogen OS launch for the Chinese market which many believe will see OnePlus move on to Android 6.0 Marshmallow.
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Previously it was rumoured that the April event could have been the launch date for the OnePlus 3 that has recently been seen in Antutu leaks. OnePlus revealed that this wasn’t the case, however the Antutu results did confirm the OnePlus 3 (A3000) will come with 4GB RAM, 32GB storage (SD support also) 1920 x 1080 5.5-inch display, 8 mega-pixel front camera, 16 mega-pixel rear and Android 6.0.1.