Samsung Galaxy S3 III Neo + (SCH-I939I) Firmware Overview
What is the latest SCH-I939I firmware?
I939IKEUAOD1, released May 7, 2015 with Android 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 S3 III Neo + still getting updates?
Most likely not: there has been no new firmware since May 2015, so Android 4.3 is the last version this model got. The final builds below are still the best choice for a clean reinstall.
All SCH-I939I firmware builds
Older SCH-I939I Builds (Archive)
3 earlier builds from the samdb.org catalogue. They are not in the download list above; the link searches for the build on the partner site.
How to Flash SCH-I939I Firmware
Put the Samsung Galaxy S3 III Neo + 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.