Samsung GALAXY Tab S
The latest firmware for Samsung GALAXY Tab S (SCT21) is SCT21KDU1CQG1 with Android 6.0.1 (Marshmallow), released on June 29, 2017 for 1 region (CSC). Every official firmware build for SCT21, 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/SCT21KDU1CQG1
All 2 builds in our database run Android 6.0.1 (Marshmallow). The newest build, SCT21KDU1CQG1, was released on June 29, 2017. No new build has appeared for 113 months, so regular updates for this model have most likely ended.
The newest firmware for SCT21 runs Android 6.0.1 (Marshmallow): build SCT21KDU1CQG1, released on June 29, 2017.
The latest build for SCT21, SCT21KDU1CQG1, was released on June 29, 2017 (9 years ago).
SCT21 has had no new firmware for 113 months, so regular updates have most likely ended.
Yes, all firmware files for SCT21 are 100% official, original, and obtained directly from Samsung servers.
To flash SCT21, 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 SCT21.