
Samsung Galaxy Note3
The latest firmware for Samsung Galaxy Note3 (SM-N9007) is N9007DIUDOA1 with Android 4.4.2 (KitKat), released on January 7, 2015 for 1 region (CSC). Every official firmware build for SM-N9007, 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/N9007DIUDOA1
All 12 builds in our database run Android 4.4.2 (KitKat). The newest build, N9007DIUDOA1, was released on January 7, 2015. No new build has appeared for 143 months, so regular updates for this model have most likely ended.
Specifications of SM-N900, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.

SM-N920AZW

SM-N920VZW

SM-N950UZK

SM-N920AZK

SM-N950X

SM-N930V

SM-N9300

SM-N930S
The newest firmware for SM-N9007 runs Android 4.4.2 (KitKat): build N9007DIUDOA1, released on January 7, 2015.
The latest build for SM-N9007, N9007DIUDOA1, was released on January 7, 2015 (11 years ago).
SM-N9007 has had no new firmware for 143 months, so regular updates have most likely ended.
Yes, all firmware files for SM-N9007 are 100% official, original, and obtained directly from Samsung servers.
To flash SM-N9007, 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-N9007.