Pantech Vega Secret Up is the one of Android smartphone that offers in Korean makrket with Android Jelly Bean, but now the phone is getting Android 4.4.2 KitKat update.
This update is announce from it’s official website and there are three different versions of Pantech Vega Secret Up in the Korean market and all three versions are getting the KitKat update. Those version are Vega Secret Up IM-A900S for SK Telecom, Pantech Vega Secret Up IM-A900L for LG U+ and Pantech Vega Secret Up IM-A900K for KT carrier.
If you’re the user of one of those model, you can check your system through System update and make sure you’re using WiFi signal for update and plug the phone through the charger if yor phoe battery less than 40%. [source]