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 get the Knock Code update. Knock Code is touted as being able to provide more security over conventional password and pattern-based unlocking options, with LG claiming that it “offers a level of security far greater than other devices, even those with fingerprint recognition systems” — though I’m a tad skeptical about that.