Microsoft is updating its range of Surface tablets following weak sales of the original models. The updates include faster processors and higher-resolution screens and cameras.

The Surface Pro 2 tablet can be paired with an optional docking station

Both the ARM-based Windows RT version and Intel-powered Windows 8 edition are being upgraded.

The firm previously posted a $900m (£560m) writedown after building more of the first-generation RT versions than it could sell.

Analysts said demand for Microsoft's devices might continue to lag behind rival products.

However, they added that the firm's support for the product line was part of a long-term strategy that might ultimately pay off.

Windows-based tablets accounted for a 7% share of global shipments in the April-to-June quarter, according to a study by the tech advisory service Gartner.

By contrast, it said, Android-based tablets - including Samsung's Galaxy series, Android's Kindle Fires and Google's Nexus-branded range - had a 48% share, while Apple's iPads took 45% of the market.

(Source: BBC)