
Samsung Galaxy E5
The latest firmware for Samsung Galaxy E5 (SM-E500YZ) is E500YZZTS1AQA1 with Android 4.4.4 (KitKat), released on February 16, 2017 for 1 region (CSC). Every official firmware build for SM-E500YZ, 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/E500YZZTS1AQA1
All 3 builds in our database run Android 4.4.4 (KitKat). The newest build, E500YZZTS1AQA1, was released on February 16, 2017. No new build has appeared for 118 months, so regular updates for this model have most likely ended.
Specifications of SM-E500, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.

SM-E500M

SM-E5260

SM-E700M

SM-E426S

SM-E625F
The newest firmware for SM-E500YZ runs Android 4.4.4 (KitKat): build E500YZZTS1AQA1, released on February 16, 2017.
The latest build for SM-E500YZ, E500YZZTS1AQA1, was released on February 16, 2017 (9 years ago).
SM-E500YZ has had no new firmware for 118 months, so regular updates have most likely ended.
Yes, all firmware files for SM-E500YZ are 100% official, original, and obtained directly from Samsung servers.
To flash SM-E500YZ, 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-E500YZ.