
Samsung Galaxy J4+
The latest firmware for Samsung Galaxy J4+ (SM-J415N) is J415NKOS2CVJ1 with Android 10, released on November 14, 2022 for 1 region (CSC). Every official firmware build for SM-J415N, 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/J415NKOS2CVJ1
SM-J415N started on Android 8 and has received 2 major Android upgrades; it now runs Android 10. The newest build, J415NKOS2CVJ1, was released on November 14, 2022. No new build has appeared for 48 months, so regular updates for this model have most likely ended.
Specifications of SM-J415F, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.

SM-J327VPP

SM-J100VPP

SM-J260A

SM-J120P

SM-J737A

SM-J727A

SM-J727VPP

SM-J327A
The newest firmware for SM-J415N runs Android 10: build J415NKOS2CVJ1, released on November 14, 2022.
The latest build for SM-J415N, J415NKOS2CVJ1, was released on November 14, 2022 (3 years ago).
SM-J415N has had no new firmware for 48 months, so regular updates have most likely ended.
Yes, all firmware files for SM-J415N are 100% official, original, and obtained directly from Samsung servers.
To flash SM-J415N, 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 SM-J415N.