
Samsung Galaxy S3 Neo+
The latest firmware for Samsung Galaxy S3 Neo+ (GT-I9301I) is I9301IXCUARA1 with Android 4.4.2 (KitKat), released on January 14, 2018 for 1 region (CSC). Every official firmware build for GT-I9301I, newest first: one row per build with all regions (CSC) that received it.
Each firmware build has its own page at https://samfirm.shop/build/{PDA}, where {PDA} is the build number from the list above. Example: https://samfirm.shop/build/I9301IXCUARA1
All 41 builds in our database run Android 4.4.2 (KitKat). The newest build, I9301IXCUARA1, was released on January 14, 2018. No new build has appeared for 106 months, so regular updates for this model have most likely ended.

GT-I9308

GT-I9268

GT-I9228

GT-I9210

GT-I9108
The newest firmware for GT-I9301I runs Android 4.4.2 (KitKat): build I9301IXCUARA1, released on January 14, 2018.
The latest build for GT-I9301I, I9301IXCUARA1, was released on January 14, 2018 (8 years ago).
GT-I9301I has had no new firmware for 106 months, so regular updates have most likely ended.
Yes, all firmware files for GT-I9301I are 100% official, original, and obtained directly from Samsung servers.
To flash GT-I9301I, 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 GT-I9301I.