
Samsung Galaxy J1(2016)
The latest firmware for Samsung Galaxy J1(2016) (SM-J120H) is J120HXXU0ARL1 with Android 5.1.1, released on December 17, 2018 for 18 regions (CSC). Every official firmware build for SM-J120H, 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/J120HXXU0ARL1
All 50 builds in our database run Android 5.1.1. The newest build, J120HXXU0ARL1, was released on December 17, 2018. No new build has appeared for 95 months, so regular updates for this model have most likely ended.
Specifications of SM-J120, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.

SM-J120P

SM-J110M

SM-J327VPP

SM-J320VPP

SM-J326AZ
The newest firmware for SM-J120H runs Android 5.1.1: build J120HXXU0ARL1, released on December 17, 2018.
The latest build for SM-J120H, J120HXXU0ARL1, was released on December 17, 2018 (7 years ago).
SM-J120H has had no new firmware for 95 months, so regular updates have most likely ended.
Yes, all firmware files for SM-J120H are 100% official, original, and obtained directly from Samsung servers.
To flash SM-J120H, 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-J120H.