The company said the update was issued in response to "recent retailer actions" over its tablet device, which is based on the Nvidia Tegra II chipset and runs on Google's Android operating system (OS) 2.2.
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Jeff Volpe, vice-president for Viewsonic Americas, said in a statement, "We always listen to customers; while they love the hardware, they raised several issues about the user interface. As a result, our software partner is releasing an upgrade that will address customer concerns."
It is unclear which UI will be updated, but Volpe said, "Customers will have the flexibility to use both a standard Android interface as well as a user-customisable interface, which has been significantly enhanced since the product launch."
Unlike Apple's iPad, the G-Tablet will also include Adobe Flash. Viewsonic confirmed that the product would be certified for Adobe Flash by end of January 2011. In the interim, users can download Flash from various websites that distribute Android applications, the company said.
G-Tablet owners will automatically receive the upgrade through its wi-fi connection by Friday this week. Users need to accept the update request.