Galaxy S21 5G

Download Samsung Firmware SM-G991N

Samsung Galaxy S21 5G

The latest firmware for Samsung Galaxy S21 5G (SM-G991N) is G991NKSSCHZA9 with Android 15, released on March 12, 2026 for 4 regions (CSC). Every official firmware build for SM-G991N, newest first: one row per build with all regions (CSC) that received it.

Latest build
G991NKSSCHZA9 Android 15 · 7 months ago
Builds
51 builds
Regions (CSC)
4 regions

Firmware builds for SM-G991N

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/G991NKSSCHZA9

SM-G991N update history

SM-G991N started on Android 11 and has received 4 major Android upgrades; it now runs Android 15. The newest build, G991NKSSCHZA9, was released on March 12, 2026. No new build has appeared for 7 months, so regular updates for this model have most likely ended.

Device specifications

Display diagonal
15.8 cm (6.2")
Display resolution
2400 x 1080 pixels
Display type
Dynamic AMOLED 2X
RAM
8 GB
Rear camera resolution
12 MP
Rear camera type
Triple camera
Battery capacity
4000 mAh
Weight
171 g

Specifications of SM-G991, a regional variant of the same device. Chipset and SIM lines are left out: they can differ by region.

Changelog for SM-G991N

No changelog details available.

Similar Models

Frequently Asked Questions

What is the latest Android version for SM-G991N?

The newest firmware for SM-G991N runs Android 15: build G991NKSSCHZA9, released on March 12, 2026.

When did SM-G991N get its last update?

The latest build for SM-G991N, G991NKSSCHZA9, was released on March 12, 2026 (7 months ago).

How often does SM-G991N get updates?

SM-G991N has had no new firmware for 7 months, so regular updates have most likely ended.

Is the firmware for SM-G991N official?

Yes, all firmware files for SM-G991N are 100% official, original, and obtained directly from Samsung servers.

How to flash Samsung SM-G991N using Odin?

To flash SM-G991N, 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.

Can I downgrade the Android version on SM-G991N?

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-G991N.