
Samsung Galaxy S5
The latest firmware for Samsung Galaxy S5 (SM-G900I) is G900IDDS1CSA1 with Android 6.0.1 (Marshmallow), released on April 4, 2019 for 2 regions (CSC). Every official firmware build for SM-G900I, 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/G900IDDS1CSA1
SM-G900I started on Android 4 and has received 2 major Android upgrades; it now runs Android 6.0.1 (Marshmallow). The newest build, G900IDDS1CSA1, was released on April 4, 2019. No new build has appeared for 92 months, so regular updates for this model have most likely ended.
Specifications of SM-G900, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.
· The security of your device has been improved.

SM-G900AZ

SM-G9098

SM-G903W

SM-G901F

SM-G800X
The newest firmware for SM-G900I runs Android 6.0.1 (Marshmallow): build G900IDDS1CSA1, released on April 4, 2019.
The latest build for SM-G900I, G900IDDS1CSA1, was released on April 4, 2019 (7 years ago).
SM-G900I has had no new firmware for 92 months, so regular updates have most likely ended.
Yes, all firmware files for SM-G900I are 100% official, original, and obtained directly from Samsung servers.
To flash SM-G900I, 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-G900I.