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Samsung GALAXY S21 Detailed Specifications

Build OS Android 11 OS  
UI One UI 3.1  
Dimensions 151.7 x 71.2 x 7.9 mm  
Weight 171 g  
SIM Dual Sim, Dual Standby, eSIM (Nano-SIM)  
Colors Phantom Gray, Phantom White, Phantom Violet, Phantom Pink  
Frequency 2G Band SIM1: GSM 850 / 900 / 1800 / 1900
SIM2: GSM 850 / 900 / 1800 / 1900  
3G Band HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100  
4G Band LTE band 1(2100), 2(1900), 3(1800), 4(1700/2100), 5(850), 7(2600), 8(900), 12(700), 13(700), 17(700), 18(800), 19(800), 20(800), 25(1900), 26(850), 28(700), 32(1500), 38(2600), 39(1900), 40(2300), 41(2500), 66(1700/2100)  
5G Band 5G SA/NSA  
Processor CPU Octa-core (1 x 2.9 GHz Cortex-X1 + 3 x 2.80 GHz Cortex-A78 + 4 x 2.2 GHz Cortex-A55)  
Chipset Exynos 2100 (5 nm)  
GPU Mali-G78 MP14  
Display Technology Dynamic AMOLED 2X Capacitive Touchscreen, 16M Colors, Multitouch  
Size 6.2 Inches  
Resolution 1080 x 2400 Pixels (~424 PPI)  
Protection Corning Gorilla Glass Victus  
Extra Features Eye Comfort Shield, Always-on display, 120Hz, HDR10+, 1300 nits (peak)  
Memory Built-in 128/256GB Built-in, 8GB RAM, UFS 3.1  
Card No  
Camera Main Triple Camera: 12 MP, f/1.8, 26mm (wide), 1/1.76", Dual Pixel PDAF, OIS + 64 MP, f/2.0, 28mm (telephoto), 1/1.76", PDAF, OIS, 1.1x optical zoom, 3x hybrid zoom + 12 MP, f/2.2, 13mm, (ultrawide), 1/2.55", Super Steady video, LED Flash  
Features Geo-tagging, touch focus, face/smile detection, Auto HDR, panorama, Video (8K@30fps, 4K@30/60fps, 1080p@30/60/120fps, 720p@960fps, HDR10+, stereo sound rec., gyro-EIS & OIS)  
Front 10 MP, f/2.2, 26mm (wide), 1/3.24  
Connectivity WLAN Wi-Fi 802.11 a/b/g/n/ac/6e, dual-band, Wi-Fi Direct, hotspot  
Bluetooth v5.0 with A2DP, LE  
GPS Yes + A-GPS support & Glonass, BDS, GALILEO  
USB USB Type-C 3.2, USB On-The-Go  
NFC Yes  
Data GPRS, Edge, 3G (HSPA 42.2/5.76 Mbps), 4G LTE-A (CA), 5G capable  
Features Sensors Accelerometer, Barometer, Compass, Fingerprint (under display, ultrasonic), Gyro, Proximity, SpO2  
Audio 32-bit/384kHz audio, MP4/DivX/XviD/WMV/H.265 player, MP3/WAV/WMA/eAAC+/FLAC player, Speaker Phone  
Browser HTML5  
Messaging SMS(threaded view), MMS, Email, Push Mail, IM  
Games Built-in + Downloadable  
Torch Yes  
Extra Glass front + Gorilla Glass Victus), Plastic back, Aluminum frame, Stylus support, Tuned by AKG, Active noise cancellation with dedicated mic, ANT+, Bixby natural language commands and dictation, Samsung DeX, Samsung Wireless DeX (desktop experience support), Samsung Pay (Visa, MasterCard certified), IP68 dust/water resistant (up to 1.5m for 30 mins), Document viewer, Photo/video editor  
Battery Capacity (Li-Po Non removable), 4000 mAh  
- Fast charging 25W, USB Power Delivery 3.0, Fast Qi/PMA wireless charging 15W, Reverse wireless charging 4.5W  

Download Samsung GALAXY S21 SM-G991N - SKC - G991NKSS8GYC1

Download the firmware flash file GALAXY S21 with the code SM-G991N. Samsung's latest firmware for the region with CSC code is Kr flag  SKC (SKC - Korea (South)). This firmware PDA version is G991NKSS8GYC1, and the Android version is U (Android 14). This firmware file size is 7.39 GB. Please make sure the Galaxy model code is correct. You can check the model code on your Phone, Setting - About, Download mode, or you can find it by flipping your phone or among the things you found in the box.

This firmware is official from the Samsung Cloud Server. Of course, we recommend using official Samsung tools like Samsung Smart Switch or Samsung Kies. Samfirms.com will not be responsible for any damage caused by using the files on this website.

Samsung Firmware Details & Specifications

Device Name

GALAXY S21

Model Number

SM-G991N

Product Brand

SAMSUNG

Android OS

U (Android 14)

AP Version (PDA)

G991NKSS8GYC1

CSC Version

G991NOKR8GYC1

CSC Country Code

korea (south) flag SKC (Korea (south))

Binary Level (BIT/U)

8

Build Date

20250307093150

File Size

7.39 GB

Download Official Samsung Firmware: This firmware package includes the latest Android OS update, security patches, and system improvements for GALAXY S21 model SM-G991N. Compatible with CSC code SKC region. Flash using Odin tool for Samsung devices. Always backup your data before updating firmware.

How to flash Samsung SM-G991N/GALAXY S21 firmware

  1. Enter Download Mode: Power off your device, then press Volume Down + Power + Home (or Volume Down + Power for newer devices). Confirm with Volume Up.

  2. Open Odin: Run Odin3 v3.13.1 as admin on your PC.

  3. Connect Device: Plug your device into the PC via USB. Odin should show a blue COM port.

  4. Load Firmware: Click AP/PDA and select your firmware file.

  5. Start Flashing: Ensure Auto Reboot and F. Reset Time are checked, then hit Start.

  6. Wait: A PASS! message means success. Your device will reboot automatically.

Tips and Precautions

Before attempting to flash your Samsung firmware, make sure you:

  • Make sure Samsung USB Drivers are installed.
  • Extract the firmware using WinRAR or 7-Zip.
  • Have a backup of your device's data, as flashing firmware can erase all data.
  • Follow the instructions carefully, as any mistakes can cause issues with your device.

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