Samsung Galaxy J2 Pure
The latest firmware for Samsung Galaxy J2 Pure (SM-J260AZ) is J260AZTUSDBVA2 with Android 9, released on January 5, 2022 for 1 region (CSC). Every official firmware build for SM-J260AZ, 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/J260AZTUSDBVA2
All 9 builds in our database run Android 9. The newest build, J260AZTUSDBVA2, was released on January 5, 2022. No new build has appeared for 58 months, so regular updates for this model have most likely ended.
Specifications of SM-J260F, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.

SM-J260A

SM-J250Y

SM-J337A

SM-J330N

SM-J327VPP
The newest firmware for SM-J260AZ runs Android 9: build J260AZTUSDBVA2, released on January 5, 2022.
The latest build for SM-J260AZ, J260AZTUSDBVA2, was released on January 5, 2022 (4 years ago).
SM-J260AZ has had no new firmware for 58 months, so regular updates have most likely ended.
Yes, all firmware files for SM-J260AZ are 100% official, original, and obtained directly from Samsung servers.
To flash SM-J260AZ, 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-J260AZ.