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Samsung Galaxy S21 (SM-G991Q) official device image

Samsung Galaxy S21 (SM-G991Q)

Brand samsung
Codename sm-g991q
Region SJP
Official Firmware

Download Samsung Galaxy S21 (SM-G991Q) Firmware

Samsung Galaxy S21 (SM-G991Q) • Region: SJP

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Firmware Downloads

Find and download official MIUI firmware for Samsung Galaxy S21 (SM-G991Q) (sm-g991q). All firmware files include MD5 hash verification and are available for direct download.

Samsung Galaxy S21 (SM-G991Q)

Version Method Size Release Date MD5 Hash Download
G991QOPU1CVK6/G991QQOP1CVK6/G991QOPU1CVK6 Odin 1 B N/A
G991QOPU1AUE5/G991QQOP1AUE5/G991QOPU1AUE5 Odin 1 B N/A
G991QOPU1BVB4/G991QSJP1BVB4/G991QOPU1BVB4 Odin 1 B N/A
G991QOPU1EYF3/G991QSJP1EYF3/G991QOPU1EYF3 Odin 331 B N/A
G991QOPU1CWH3/G991QQOP1CWH3/G991QOPU1CWH3 Odin 2 B N/A
G991QOPU1DWL2/G991QQOP1DWL2/G991QOPU1DWL2 Odin 1 B N/A
G991QOPU1CWF2/G991QQOP1CWF2/G991QOPU1CWF2 Odin 1 B N/A
G991QOPU1CWD2/G991QQOP1CWD2/G991QOPU1CWD2 Odin 1 B N/A
G991QOPU1CWB2/G991QSJP1CWB2/G991QOPU1CWB2 Odin 1 B N/A
G991QOPS1BVJ2/G991QSJP1BVJ2/G991QOPS1BVJ2 Odin 2 B N/A
G991QOPU1AUJ2/G991QSJP1AUJ2/G991QOPU1AUJ2 Odin 2 B N/A
G991QOPS1EYJ1/G991QSJP1EYJ1/G991QOPS1EYJ1 Odin 282 B N/A
G991QOPS1DXJ1/G991QSJP1DXJ1/G991QOPS1DXJ1 Odin 3 B N/A
G991QOPU1BVH1/G991QSJP1BVH1/G991QOPU1BVH1 Odin 273 B N/A
G991QOPU1BVF1/G991QSJP1BVF1/G991QOPU1BVF1 Odin 421 B N/A
G991QOPU1BVC1/G991QQOP1BVC1/G991QOPU1BVC1 Odin 1 B N/A
G991QOPS1BVB1/G991QQOP1BVB1/G991QOPS1BVB1 Odin 1 B N/A
G991QOPU1DXDF/G991QSJP1DXDF/G991QOPU1DXDF Odin 362 B N/A
G991QOPU1AUGB/G991QSJP1AUGB/G991QOPU1AUGB Odin 1 B N/A

Device Specifications

Versions: SM-G991B, SM-G991B/DS (International); SM-G991U (USA); SM-G991U1 (USA unlocked); SM-G991W (Canada); SM-G991N (Korea); SM-G9910 (China)

NetworkTechnologyGSM / CDMA / HSPA / EVDO / LTE / 5G
2G bandsGSM 850 / 900 / 1800 / 1900
 CDMA 800 / 1900 & TD-SCDMA
3G bandsHSDPA 850 / 900 / 1700(AWS) / 1900 / 2100
 CDMA2000 1xEV-DO
4G bands1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 18, 19, 20, 25, 26, 28, 30, 38, 39, 40, 41, 46, 48, 66, 71 - SM-G991U1
 1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28, 32, 38, 39, 40, 41, 66 - SM-G991B
5G bands2, 5, 25, 41, 66, 71, 260, 261 SA/NSA/Sub6/mmWave - SM-G991U1
 1, 3, 5, 7, 8, 20, 28, 38, 40, 41, 66, 77, 78 SA/NSA/Sub6 - SM-G991B
SpeedHSPA 42.2/5.76 Mbps, LTE (7CA) Cat20 2000/200 Mbps, 5G (5+ Gbps DL)
LaunchAnnounced2021, January 14
StatusAvailable. Released 2021, January 29
BodyDimensions151.7 x 71.2 x 7.9 mm (5.97 x 2.80 x 0.31 in)
Weight169 g (Sub6), 171 g (mmWave) (5.96 oz)
BuildGlass front (Gorilla Glass Victus), plastic back, aluminum frame
SIM· Nano-SIM + eSIM
· Nano-SIM + Nano-SIM + eSIM (max 2 at a time)
 IP68 dust tight and water resistant (immersible up to 1.5m for 30 min)
DisplayTypeDynamic AMOLED 2X, 120Hz, HDR10+, 1300 nits (peak)
Size6.2 inches, 94.1 cm2 (~87.2% screen-to-body ratio)
Resolution1080 x 2400 pixels, 20:9 ratio (~421 ppi density)
ProtectionCorning Gorilla Glass Victus
PlatformOSAndroid 11, up to 4 major Android upgrades, One UI 7
ChipsetExynos 2100 (5 nm) - International
Qualcomm SM8350 Snapdragon 888 5G (5 nm) - USA/China
CPUOcta-core (1x2.9 GHz Cortex-X1 & 3x2.80 GHz Cortex-A78 & 4x2.2 GHz Cortex-A55) - International
Octa-core (1x2.84 GHz Cortex-X1 & 3x2.42 GHz Cortex-A78 & 4x1.80 GHz Cortex-A55) - USA/China
GPUMali-G78 MP14 - International
Adreno 660 - USA/China
MemoryCard slotNo
Internal128GB 6GB RAM, 128GB 8GB RAM, 256GB 8GB RAM
 UFS 3.1
Main CameraTriple12 MP, f/1.8, 26mm (wide), 1/1.76", 1.8µm, dual pixel PDAF, OIS
64 MP, f/2.0, 29mm (telephoto), 1/1.72", 0.8µm, PDAF, OIS, 1.1x optical zoom, 3x hybrid zoom
12 MP, f/2.2, 13mm, 120˚ (ultrawide), 1/2.55" 1.4µm, Super Steady video
FeaturesLED flash, auto-HDR, panorama
Video8K@24fps, 4K@30/60fps, 1080p@30/60/120/240fps, HDR10+, stereo sound rec., gyro-EIS
Selfie cameraSingle10 MP, f/2.2, 26mm (wide), 1/3.24", 1.22µm, dual pixel PDAF
FeaturesHDR
Video4K@30/60fps, 1080p@30fps
SoundLoudspeaker Yes, with stereo speakers
3.5mm jack No
 High-bitrate audio support
CommsWLANWi-Fi 802.11 a/b/g/n/ac/6, dual-band, Wi-Fi Direct
Bluetooth5.0, A2DP, LE
PositioningGPS, GLONASS, BDS, GALILEO
NFCYes
RadioFM radio (Snapdragon model only; market/operator dependent)
USBUSB Type-C 3.2, OTG
FeaturesSensorsFingerprint (under display, ultrasonic), accelerometer, gyro, proximity, compass, barometer
 Samsung DeX, Samsung Wireless DeX (desktop experience support)
BatteryTypeLi-Ion 4000 mAh
Charging25W wired, PD3.0
15W wireless (Qi)
4.5W reverse wireless
MiscColorsPhantom Gray, Phantom White, Phantom Violet, Phantom Pink
ModelsSM-G991B, SM-G991B/DS, SM-G991U, SM-G991U1, SM-G991W, SM-G991N, SM-G9910, SM-G991Q, SCG09
SAR0.74 W/kg (head)     1.08 W/kg (body)    
SAR EU0.46 W/kg (head)     1.51 W/kg (body)    
Price$ 164.44 / € 156.88 / £ 130.00
Our TestsPerformance AnTuTu: 584055 (v8)
GeekBench: 3238 (v5.1)
GFXBench: 60fps (ES 3.1 onscreen)
Display 856 nits max brightness (measured)
Camera Photo / Video
Loudspeaker -26.4 LUFS (Good)
Battery (old)
Endurance rating 93h
Data source: GSMArena

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How to Flash Firmware

Steps to Install Firmware:

  1. Download the ROM: Choose the appropriate firmware version above for your device region
  2. Backup Your Data: All data will be erased during flashing
  3. Unlock Bootloader: Required for some devices (check device-specific requirements)
  4. Download Tools: Download MIUI Flash Tool or use ADB/Fastboot
  5. Flash the ROM: Follow the tool's instructions to flash the downloaded firmware
  6. Verify: Restart and verify successful installation

⚠️ Warning: Flashing custom ROMs may void your warranty. Proceed at your own risk.

Frequently Asked Questions

Q: Is it safe to flash official firmware?

A: Yes, flashing official firmware is generally safe and won't void your warranty if done through official methods.

Q: What's the difference between Recovery and Fastboot ROMs?

A: Recovery ROMs are flashed from recovery mode, while Fastboot ROMs require bootloader unlock and ADB tools.

Q: Can I downgrade to an older firmware version?

A: Some devices allow downgrading, but it depends on the device and region. Check device-specific forums first.

Q: What if flashing fails?

A: If flashing fails, try using the official tool, ensure USB drivers are installed, and check device compatibility.