
Samsung Galaxy J1
Every official firmware build for SM-J120W, 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/J120WVLS2AQL1
Specifications of SM-J120WZ, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.
Box codes of SM-J120W for different colors and markets. Firmware is chosen by the model code SM-J120W and your region (CSC), not by the SKU.

SM-J120P

SM-J110M

SM-J327VPP

SM-J320VPP

SM-J326AZ
You can find the firmware on the model: SM-J120W page.
Yes, all firmware files for SM-J120W are 100% official, original, and obtained directly from Samsung servers.
To flash SM-J120W, 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-J120W.