LG introduced a feature known as ‘Knock Code’ when it took the wraps off its G Pro 2 flagship smartphone last month, which lets users activate the display by tapping one of up to over 80,000 programmable combinations. The feature has been making an appearance on its smartphone models unveiled so far this year, including the F series and L series. Now LG has announced that the Knock Code feature will be made available on earlier key smartphone models via a firmware update starting in April. Those who have the LG G2 and G Flex in “specific countries” will be the first to…

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