
Samsung Galaxy-Haechi
The latest firmware for Samsung Galaxy-Haechi (SM-G888N0) is G888N0KOU1AUE1 with Android 6.0.1 (Marshmallow), released on June 16, 2021 for 1 region (CSC). Every official firmware build for SM-G888N0, 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/G888N0KOU1AUE1
All 5 builds in our database run Android 6.0.1 (Marshmallow). The newest build, G888N0KOU1AUE1, was released on June 16, 2021. No new build has appeared for 65 months, so regular updates for this model have most likely ended.

SM-G889A

SM-G887N

SM-G885Y

SM-G870F0

SM-G988Q
The newest firmware for SM-G888N0 runs Android 6.0.1 (Marshmallow): build G888N0KOU1AUE1, released on June 16, 2021.
The latest build for SM-G888N0, G888N0KOU1AUE1, was released on June 16, 2021 (5 years ago).
SM-G888N0 has had no new firmware for 65 months, so regular updates have most likely ended.
Yes, all firmware files for SM-G888N0 are 100% official, original, and obtained directly from Samsung servers.
To flash SM-G888N0, 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-G888N0.