Samsung Galaxy Mega 6.3 Duos (China) SCH-P729 Firmware Overview
What is the latest SCH-P729 firmware?
P729KEUCNI1, released November 3, 2014 with Android 4.1–4.3. The archive holds 3 official builds across 1 region (CSC). Each one is the full stock ROM (flash file) for Odin, not an OTA patch.
Is the Samsung Galaxy Mega 6.3 Duos (China) still getting updates?
Most likely not: there has been no new firmware since November 2014, so Android 4.1–4.3 is the last version this model got. The final builds below are still the best choice for a clean reinstall.
All SCH-P729 firmware builds
How to Flash SCH-P729 Firmware
Put the Samsung Galaxy Mega 6.3 Duos (China) 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.