
Samsung Galaxy A6s
Every official firmware build for SM-G6200, newest first: one row per build with all regions (CSC) that received it.

SM-G525N

SM-G720N0

SM-G611S

SM-G610S

SM-G615FU
You can find the firmware on the model: SM-G6200 page.
Yes, all firmware files for SM-G6200 are 100% official, original, and obtained directly from Samsung servers.
To flash SM-G6200, 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-G6200.