
Samsung Galaxy On Max
The latest firmware for Samsung Galaxy On Max (SM-G615FU) is G615FUDDS2BUD2 with Android 8.1.0 (Oreo), released on May 25, 2021 for 1 region (CSC). Every official firmware build for SM-G615FU, 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/G615FUDDS2BUD2
SM-G615FU started on Android 7 and has received 1 major Android upgrade; it now runs Android 8.1.0 (Oreo). The newest build, G615FUDDS2BUD2, was released on May 25, 2021. No new build has appeared for 66 months, so regular updates for this model have most likely ended.
· Device stability improvements, bug fixes.
· New and / or enhanced features.
· Further improvements to performance.

SM-G615F

SM-G611S

SM-G610S

SM-G6200

SM-G715A
The newest firmware for SM-G615FU runs Android 8.1.0 (Oreo): build G615FUDDS2BUD2, released on May 25, 2021.
The latest build for SM-G615FU, G615FUDDS2BUD2, was released on May 25, 2021 (5 years ago).
SM-G615FU has had no new firmware for 66 months, so regular updates have most likely ended.
Yes, all firmware files for SM-G615FU are 100% official, original, and obtained directly from Samsung servers.
To flash SM-G615FU, 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-G615FU.