HTC is not only updating their latest smartphones, but also their One M8's predecessor handset and the Taiwanese company's 2013 flagship phone, HTC One (M7). According to the new reports of GSMArena, the phone in the European regions have started getting the 4.4.3 KitKat treatment from the phone manufacturer, where some piece of evidence of the new OTA roll out comes in from Slovakia and Romania, alongside the unlocked versions, HTC is also taking good care of carrier versions of the same phones, as well with the KitKat.
It's said, Google have incorporated the security fixes from 4.4.4 KitKat update to HTC's new 4.4.3 update, which should make this 550 megabytes heavy refurbish a last one from the KitKat series, before seeing the next Android L release update for the phones in the coming future. The new build number is read as, 6.09.401.5, bringing a number of upgrades and enhancements to phone, Google apps and pre-loaded HTC applications.
Source: GSMArena