
Samsung Galaxy S 2 X (T-Mobile)
The latest firmware for Samsung Galaxy S 2 X (T-Mobile) (SGH-T989D) is T989DTLLG2 with Ice(Android Cream), released on July 12, 2012 for 1 region (CSC). Every official firmware build for SGH-T989D, 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/T989DTLLG2
All 3 builds in our database run Android 4.1.2. The newest build, T989DTLLG2, was released on July 12, 2012. No new build has appeared for 173 months, so regular updates for this model have most likely ended.

SGH-I927

SGH-S730M

SGH-T999N

SGH-T859

SGH-T599V

SGH-I757M

SGH-I747

SGH-I717R
The newest firmware for SGH-T989D runs Android 4.1.2: build T989DTLLG2, released on July 12, 2012.
The latest build for SGH-T989D, T989DTLLG2, was released on July 12, 2012 (14 years ago).
SGH-T989D has had no new firmware for 173 months, so regular updates have most likely ended.
Yes, all firmware files for SGH-T989D are 100% official, original, and obtained directly from Samsung servers.
To flash SGH-T989D, 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-T989D.