
Samsung Galaxy K Zoom
Every official firmware build for SM-C115, 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/C115XXS1BPL7
Box codes of SM-C115 for different colors and markets. Firmware is chosen by the model code SM-C115 and your region (CSC), not by the SKU.

SM-C115W

SM-C1116

SM-C105S

SM-C500X

SM-C5018
You can find the firmware on the model: SM-C115 page.
Yes, all firmware files for SM-C115 are 100% official, original, and obtained directly from Samsung servers.
To flash SM-C115, 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-C115.