
Samsung GALAXY J
The latest firmware for Samsung GALAXY J (SGH-N075T) is N075TZTUANE1 with Jelly(Android Bean), released on May 22, 2014 for 1 region (CSC). Every official firmware build for SGH-N075T, 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/N075TZTUANE1
SGH-N075T started on Android 4 and has received 1 major Android upgrade; it now runs Android 5.0 (Lollipop). The newest build, N075TZTUANE1, was released on May 22, 2014. No new build has appeared for 151 months, so regular updates for this model have most likely ended.

SGH-I927

SGH-S730M

SGH-T999N

SGH-T989D

SGH-T859

SGH-T599V

SGH-I757M

SGH-I747
The newest firmware for SGH-N075T runs Android 5.0 (Lollipop): build N075TZTUANE1, released on May 22, 2014.
The latest build for SGH-N075T, N075TZTUANE1, was released on May 22, 2014 (12 years ago).
SGH-N075T has had no new firmware for 151 months, so regular updates have most likely ended.
Yes, all firmware files for SGH-N075T are 100% official, original, and obtained directly from Samsung servers.
To flash SGH-N075T, 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 SGH-N075T.