Samsung Galaxy Core (GT-I8260) Firmware Overview
What is the latest GT-I8260 firmware?
I8260XXAPA1, released February 5, 2016 for region PHN with Android 4.1.2. The archive holds 2 official builds for this region.
Is the Samsung Galaxy Core still getting updates?
Most likely not: there has been no new firmware since February 2016, so Android 4.1.2 is the last version this model got. The final builds below are still the best choice for a clean reinstall.
GT-I8260 firmware for region PHN
How to Flash GT-I8260 Firmware
Put the Samsung Galaxy Core into Download Mode, load the BL, AP, CP and CSC files into Odin on a Windows PC and press Start. Use HOME_CSC to keep your data, CSC for a full wipe.