
Samsung Amazing
Every official firmware build for SGH-S730M, newest first: one row per build with all regions (CSC) that received it.

SGH-I927

SGH-T999N

SGH-T989D

SGH-T859

SGH-T599V

SGH-I757M

SGH-I747

SGH-I717R
You can find the firmware on the model: SGH-S730M page.
Yes, all firmware files for SGH-S730M are 100% official, original, and obtained directly from Samsung servers.
To flash SGH-S730M, 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 SGH-S730M.