
Samsung Galaxy Tab4 7.0
The latest firmware for Samsung Galaxy Tab4 7.0 (SM-T230NW) is T230NWXXU1ARB1, released on May 10, 2018 for 1 region (CSC). Every official firmware build for SM-T230NW, 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/T230NWXXU1ARB1
All 5 builds in our database run Android 6.0.1 (Marshmallow). The newest build, T230NWXXU1ARB1, was released on May 10, 2018. No new build has appeared for 103 months, so regular updates for this model have most likely ended.
Specifications of SM-T230N, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.

SM-T230X

SM-T330X

SM-T337V

SM-T227

SM-T332
The newest firmware for SM-T230NW runs Android 6.0.1 (Marshmallow): build T230NWXXU1ARB1, released on May 10, 2018.
The latest build for SM-T230NW, T230NWXXU1ARB1, was released on May 10, 2018 (8 years ago).
SM-T230NW has had no new firmware for 103 months, so regular updates have most likely ended.
Yes, all firmware files for SM-T230NW are 100% official, original, and obtained directly from Samsung servers.
To flash SM-T230NW, 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-T230NW.