
Samsung Galaxy J3 Pop
The latest firmware for Samsung Galaxy J3 Pop (SM-S327VL) is S327VLUDS4ARF2 with Android 6.0.1, released on June 10, 2018 for 1 region (CSC). Every official firmware build for SM-S327VL, 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/S327VLUDS4ARF2

SM-S326DL

SM-S337TL

SM-S426DL

SM-S236D

SM-S215DL
You can find the firmware on the model: SM-S327VL page.
Yes, all firmware files for SM-S327VL are 100% official, original, and obtained directly from Samsung servers.
To flash SM-S327VL, 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-S327VL.