
Samsung Galaxy
The latest firmware for Samsung Galaxy (SCV33) is SCV33KDU1CRH2 with Android 8.0.0 (Nougat), released on August 1, 2018 for 1 region (CSC). Every official firmware build for SCV33, 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/SCV33KDU1CRH2
SCV33 started on Android 7 and has received 1 major Android upgrade; it now runs Android 8.0.0 (Nougat). The newest build, SCV33KDU1CRH2, was released on August 1, 2018. No new build has appeared for 100 months, so regular updates for this model have most likely ended.

SCV37

SCV36

SCV35

SCV32

SCV31

SCV39

SCV38
The newest firmware for SCV33 runs Android 8.0.0 (Nougat): build SCV33KDU1CRH2, released on August 1, 2018.
The latest build for SCV33, SCV33KDU1CRH2, was released on August 1, 2018 (8 years ago).
SCV33 has had no new firmware for 100 months, so regular updates have most likely ended.
Yes, all firmware files for SCV33 are 100% official, original, and obtained directly from Samsung servers.
To flash SCV33, 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 SCV33.