
Samsung GALAXY MEGA
The latest firmware for Samsung GALAXY MEGA (SHV-E310K) is E310KKTUBQA1 with Android 4.4.2, released on January 2, 2017 for 1 region (CSC). Every official firmware build for SHV-E310K, newest first: one row per build with all regions (CSC) that received it.
You can find the firmware on the model: SHV-E310K page.
Yes, all firmware files for SHV-E310K are 100% official, original, and obtained directly from Samsung servers.
To flash SHV-E310K, you need to download the appropriate firmware, put your device into Download Mode, and use the Odin tool to load the BL, AP, CP, and CSC files.
Downgrading is only possible if the bootloader version (binary bit) of the old firmware matches the current one. Always check the binary version before flashing SHV-E310K.