
Samsung GALAXY J
The latest firmware for Samsung GALAXY J (SC-02F) is SC02FOMUGPG1 with Android 5.0 (KitKat), released on July 24, 2016 for 1 region (CSC). Every official firmware build for SC-02F, 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/SC02FOMUGPG1
SC-02F started on Android 4 and has received 1 major Android upgrade; it now runs Android 5.0 (KitKat). The newest build, SC02FOMUGPG1, was released on July 24, 2016. No new build has appeared for 124 months, so regular updates for this model have most likely ended.

SC-02D

SC-02B

SC-01E

SC-01D

SC-01C
The newest firmware for SC-02F runs Android 5.0 (KitKat): build SC02FOMUGPG1, released on July 24, 2016.
The latest build for SC-02F, SC02FOMUGPG1, was released on July 24, 2016 (10 years ago).
SC-02F has had no new firmware for 124 months, so regular updates have most likely ended.
Yes, all firmware files for SC-02F are 100% official, original, and obtained directly from Samsung servers.
To flash SC-02F, 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 SC-02F.