
Samsung Galaxy Z Flip 5G
Every official firmware build for SM-F707N, 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/F707NKSS5KXH1
Specifications of SM-F707B, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.

SM-F976W

SM-F971W

SM-F976B

SM-F971B

SM-F776B

SM-F776W

SM-F968U

SM-F9680
You can find the firmware on the model: SM-F707N page.
Yes, all firmware files for SM-F707N are 100% official, original, and obtained directly from Samsung servers.
To flash SM-F707N, 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-F707N.