
Samsung Galaxy K Zoom
The latest firmware for Samsung Galaxy K Zoom (SM-C115M) is C115MVJU1APG1 with Android 4.4.2 (KitKat), released on September 20, 2016 for 2 regions (CSC). Every official firmware build for SM-C115M, 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/C115MVJU1APG1
All 10 builds in our database run Android 4.4.2 (KitKat). The newest build, C115MVJU1APG1, was released on September 20, 2016. No new build has appeared for 122 months, so regular updates for this model have most likely ended.
Specifications of SM-C115, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.

SM-C115W

SM-C1116

SM-C105S

SM-C500X

SM-C5018
The newest firmware for SM-C115M runs Android 4.4.2 (KitKat): build C115MVJU1APG1, released on September 20, 2016.
The latest build for SM-C115M, C115MVJU1APG1, was released on September 20, 2016 (10 years ago).
SM-C115M has had no new firmware for 122 months, so regular updates have most likely ended.
Yes, all firmware files for SM-C115M are 100% official, original, and obtained directly from Samsung servers.
To flash SM-C115M, 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-C115M.