
Samsung Galaxy K Zoom
Every official firmware build for SM-C111, 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/C111XXS1BPL2
Box codes of SM-C111 for different colors and markets. Firmware is chosen by the model code SM-C111 and your region (CSC), not by the SKU.

SM-C900X

SM-C710X

SM-C701X

SM-C700X

SM-C500X

SM-C5560

SM-C115W

SM-C900Y
You can find the firmware on the model: SM-C111 page.
Yes, all firmware files for SM-C111 are 100% official, original, and obtained directly from Samsung servers.
To flash SM-C111, 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-C111.