Samsung Galaxy S21 (SM-G991Q) is a samsung device (codename: sm-g991q). FirmwareMirror hosts 19 verified firmware builds, covering: SJP. Available as official firmware. Last updated: October 2025. All files MD5-verified. Free, no registration.
Find and download official Stock ROM for Samsung Galaxy S21 (SM-G991Q) (sm-g991q). All firmware files include MD5 hash verification and are available for direct download.
| Version | Method | Size | Release Date | MD5 Hash | Download |
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| G991QOPU1CVK6/G991QQOP1CVK6/G991QOPU1CVK6 | Odin | 1.84 GB | 2022-11-01 |
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| G991QOPU1AUE5/G991QQOP1AUE5/G991QOPU1AUE5 | Odin | 1.14 GB | 2021-05-01 |
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| G991QOPU1BVB4/G991QSJP1BVB4/G991QOPU1BVB4 | Odin | 1.91 GB | 2022-02-01 |
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| G991QOPU1EYF3/G991QSJP1EYF3/G991QOPU1EYF3 | Odin | 331.44 MB | 2025-06-01 |
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| G991QOPU1CWH3/G991QQOP1CWH3/G991QOPU1CWH3 | Odin | 2.14 GB | 2023-08-01 |
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| G991QOPU1DWL2/G991QQOP1DWL2/G991QOPU1DWL2 | Odin | 1.9 GB | 2023-12-01 |
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| G991QOPU1CWF2/G991QQOP1CWF2/G991QOPU1CWF2 | Odin | 1.18 GB | 2023-06-01 |
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| G991QOPU1CWD2/G991QQOP1CWD2/G991QOPU1CWD2 | Odin | 1.18 GB | 2023-04-01 |
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| G991QOPU1CWB2/G991QSJP1CWB2/G991QOPU1CWB2 | Odin | 1.7 GB | 2023-02-01 |
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| G991QOPS1BVJ2/G991QSJP1BVJ2/G991QOPS1BVJ2 | Odin | 2.14 GB | 2022-10-01 |
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| G991QOPU1AUJ2/G991QSJP1AUJ2/G991QOPU1AUJ2 | Odin | 2.44 GB | 2021-10-01 |
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| G991QOPS1EYJ1/G991QSJP1EYJ1/G991QOPS1EYJ1 | Odin | 282.94 MB | 2025-10-01 |
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| G991QOPS1DXJ1/G991QSJP1DXJ1/G991QOPS1DXJ1 | Odin | 3.08 GB | 2024-10-01 |
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| G991QOPU1BVH1/G991QSJP1BVH1/G991QOPU1BVH1 | Odin | 273.81 MB | 2022-08-01 |
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| G991QOPU1BVF1/G991QSJP1BVF1/G991QOPU1BVF1 | Odin | 421.19 MB | 2022-06-01 |
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| G991QOPU1BVC1/G991QQOP1BVC1/G991QOPU1BVC1 | Odin | 1.05 GB | 2022-03-01 |
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| G991QOPS1BVB1/G991QQOP1BVB1/G991QOPS1BVB1 | Odin | 1.77 GB | 2022-02-01 |
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| G991QOPU1DXDF/G991QSJP1DXDF/G991QOPU1DXDF | Odin | 362.92 MB | 2024-04-01 |
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| G991QOPU1AUGB/G991QSJP1AUGB/G991QOPU1AUGB | Odin | 1.06 GB | 2021-07-01 |
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Versions: SM-G991B, SM-G991B/DS (International); SM-G991U (USA); SM-G991U1 (USA unlocked); SM-G991W (Canada); SM-G991N (Korea); SM-G9910 (China)
| Network | Technology | GSM / CDMA / HSPA / EVDO / LTE / 5G |
|---|---|---|
| 2G bands | GSM 850 / 900 / 1800 / 1900 | |
| CDMA 800 / 1900 & TD-SCDMA | ||
| 3G bands | HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 | |
| CDMA2000 1xEV-DO | ||
| 4G bands | 1, 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 bands | 2, 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 | ||
| Speed | HSPA 42.2/5.76 Mbps, LTE (7CA) Cat20 2000/200 Mbps, 5G (5+ Gbps DL) |
| Launch | Announced | 2021, January 14 |
|---|---|---|
| Status | Available. Released 2021, January 29 |
| Body | Dimensions | 151.7 x 71.2 x 7.9 mm (5.97 x 2.80 x 0.31 in) |
|---|---|---|
| Weight | 169 g (Sub6), 171 g (mmWave) (5.96 oz) | |
| Build | Glass 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) |
| Display | Type | Dynamic AMOLED 2X, 120Hz, HDR10+, 1300 nits (peak) |
|---|---|---|
| Size | 6.2 inches, 94.1 cm2 (~87.2% screen-to-body ratio) | |
| Resolution | 1080 x 2400 pixels, 20:9 ratio (~421 ppi density) | |
| Protection | Corning Gorilla Glass Victus |
| Platform | OS | Android 11, up to 4 major Android upgrades, One UI 7 |
|---|---|---|
| Chipset | Exynos 2100 (5 nm) - International Qualcomm SM8350 Snapdragon 888 5G (5 nm) - USA/China | |
| CPU | Octa-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 | |
| GPU | Mali-G78 MP14 - International Adreno 660 - USA/China |
| Memory | Card slot | No |
|---|---|---|
| Internal | 128GB 6GB RAM, 128GB 8GB RAM, 256GB 8GB RAM | |
| UFS 3.1 |
| Main Camera | Triple | 12 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 |
|---|---|---|
| Features | LED flash, auto-HDR, panorama | |
| Video | 8K@24fps, 4K@30/60fps, 1080p@30/60/120/240fps, HDR10+, stereo sound rec., gyro-EIS |
| Selfie camera | Single | 10 MP, f/2.2, 26mm (wide), 1/3.24", 1.22µm, dual pixel PDAF |
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| Features | HDR | |
| Video | 4K@30/60fps, 1080p@30fps |
| Sound | Loudspeaker | Yes, with stereo speakers |
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| 3.5mm jack | No | |
| High-bitrate audio support |
| Comms | WLAN | Wi-Fi 802.11 a/b/g/n/ac/6, dual-band, Wi-Fi Direct |
|---|---|---|
| Bluetooth | 5.0, A2DP, LE | |
| Positioning | GPS, GLONASS, BDS, GALILEO | |
| NFC | Yes | |
| Radio | FM radio (Snapdragon model only; market/operator dependent) | |
| USB | USB Type-C 3.2, OTG |
| Features | Sensors | Fingerprint (under display, ultrasonic), accelerometer, gyro, proximity, compass, barometer |
|---|---|---|
| Samsung DeX, Samsung Wireless DeX (desktop experience support) |
| Battery | Type | Li-Ion 4000 mAh |
|---|---|---|
| Charging | 25W wired, PD3.0 15W wireless (Qi) 4.5W reverse wireless |
| Misc | Colors | Phantom Gray, Phantom White, Phantom Violet, Phantom Pink |
|---|---|---|
| Models | SM-G991B, SM-G991B/DS, SM-G991U, SM-G991U1, SM-G991W, SM-G991N, SM-G9910, SM-G991Q, SCG09 | |
| SAR | 0.74 W/kg (head) 1.08 W/kg (body) | |
| SAR EU | 0.46 W/kg (head) 1.51 W/kg (body) | |
| Price | $ 164.44 / € 156.88 / £ 130.00 |
| Our Tests | Performance | 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 | |
A: Yes — official firmware from the manufacturer is generally safe when you match your device's exact model number and region. Flashing the wrong region or modified firmware can cause issues.
A: Samsung Galaxy S21 (SM-G991Q) firmware is flashed using Odin. See the step-by-step guide above for the full procedure.
A: Some devices allow downgrading, others have anti-rollback protection that blocks it. Check the version-specific notes on each ROM page, or your model's community forum, before attempting a downgrade.
A: First, verify the firmware matches your exact model code (e.g. SM-S938B for Samsung, or the CPH-number for OPPO). Reinstall the manufacturer's USB drivers, use a rear USB 2.0 port directly on your PC, and retry. The troubleshooting box above the FAQ covers the most common failure modes.
