Rumours of a new Microsoft Lumia smartphone picked up pace, although the device is focused at the mid-tier, rather than reflecting an anticipated move upmarket.

Lumia 550 will apparently feature a 4.7-inch (720 pixel) HD screen, and be powered by a 1.2GHz Qualcomm Snapdragon 210 processor. It would have 8GB of onboard storage, and come in red, black, white and blue versions.

While this is not the first time that such a device has been leaked, with Microsoft’s recent shift in focus toward higher-spec and business-oriented devices, it was not clear if it would launch mass-market smartphones as part of its initial Windows 10 push.

It has already been reported that Microsoft is readying higher-spec Lumias, called either Lumia 940 and Lumia 940 XL or Lumia 950 and Lumia 950 XL. These would seem to better align with its premium push.

Rival Acer hit the headlines at IFA 2015 with a Windows 10 device that offered PC-replacement functionality, but the devices it actually announced were similarly targeted at the mid-tier.

Microsoft has scheduled an event for 6 October, at which it is expected to unveil its latest mobile devices – and an update for the Surface tablet and Band wearable may also be on the agenda.