Samsung Galaxy S21 Ultra (Korea) is a samsung device (codename: sm-g998n). FirmwareMirror hosts 57 verified firmware builds, covering: KOO, KTC. Available as official firmware. Last updated: January 2026. All files MD5-verified. Free, no registration.
Find and download official Stock ROM for Samsung Galaxy S21 Ultra (Korea) (sm-g998n). 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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| G998NKSSCHZA9/G998NOKRCHZA9/G998NKOSCHZA5 | Odin | 330.33 MB | 2026-01-01 |
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| G998NKSS9HYE5/G998NOKR9HYE5/G998NKOS9HYE5 | Odin | 328.05 MB | 2025-05-01 |
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| G998NKSU8HYD9/G998NOKR8HYD9/G998NKOU8HYD9 | Odin | 345.69 MB | 2025-04-01 |
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| G998NKSS8GYC1/G998NOKR8GYC1/G998NKOS8GYC1 | Odin | 3.37 GB | 2025-03-01 |
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| G998NKSS8GYA1/G998NOKR8GYA1/G998NKOS8GYA1 | Odin | 273.72 MB | 2025-01-01 |
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| G998NKSS8GXL1/G998NOKR8GXL1/G998NKOS8GXL1 | Odin | 290.41 MB | 2024-12-01 |
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| G998NKSS8GXK1/G998NOKR8GXK1/G998NKOS8GXK1 | Odin | 328.39 MB | 2024-11-01 |
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| G998NKSS7GXJ1/G998NOKR7GXJ1/G998NKOS7GXJ1 | Odin | 339.37 MB | 2024-10-01 |
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| G998NKSS6GXI2/G998NOKR6GXI2/G998NKOS6GXI2 | Odin | 352.47 MB | 2024-09-01 |
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| G998NKSS6GXG2/G998NOKR6GXG2/G998NKOS6GXG2 | Odin | 359.9 MB | 2024-07-01 |
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| G998NKSS6GXGJ/G998NOKR6GXGJ/G998NKOS6GXGJ | Odin | 358.99 MB | 2024-07-01 |
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| G998NKSSCHZA5/G998NOKRCHZA5/G998NKOSCHZA5 | Odin | 263.25 MB | 2026-01-01 |
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| G998NKSSBHYK5/G998NOKRBHYK5/G998NKOSBHYK5 | Odin | 291.43 MB | 2025-11-01 |
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| G998NKSSAHYH5/G998NOKRAHYH5/G998NKOSAHYH5 | Odin | 312.21 MB | 2025-08-01 |
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| G998NKSS5GXF1/G998NOKR5GXF1/G998NKOS5GXF1 | Odin | 362.45 MB | 2024-06-01 |
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| G998NKSS5GXE1/G998NOKR5GXE1/G998NKOS5GXE1 | Odin | 367.55 MB | 2024-05-01 |
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| G998NKSU4ZWI9/G998NOKR4ZWI9/G998NKOU4FWI8 | Odin | 1.07 GB | 2023-09-01 |
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| G998NKSU4EWE9/G998NOKR4EWE9/G998NKOU4EWE2 | Odin | 1.49 GB | 2023-05-01 |
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| G998NKSU4FWK7/G998NOKR4FWK7/G998NKOU4FWK6 | Odin | 2.2 GB | 2023-11-01 |
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| G998NKSU4EWH5/G998NOKR4EWH5/G998NKOU4EWH5 | Odin | 261.38 MB | 2023-08-01 |
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| G998NKSU4FXD3/G998NOKR4FXD3/G998NKOU4FXD1 | Odin | 2.2 GB | 2024-04-01 |
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| G998NKSS4EWK2/G998NOKR4EWK2/G998NKOU4EWH5 | Odin | 2.59 GB | 2023-11-01 |
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| G998NKSS4FXAD/G998NOKR4FXAD/G998NKOU4FWK6 | Odin | 2.2 GB | 2024-01-01 |
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| G998NKSU4GXDC/G998NOKR4GXDC/G998NKOU4GXDA | Odin | 366.12 MB | 2024-04-01 |
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| G998NKSU4EWCI/G998NOKR4EWCI/G998NKOU4EWCG | Odin | 1.83 GB | 2023-03-01 |
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| G998NKSU3BUK9/G998NOKR3BUK9/G998NKOU3BUK9 | Odin | 2.05 GB | 2021-11-01 |
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| G998NKSU3AUE8/G998NOKR3AUE8/G998NKOU3AUE6 | Odin | 999.96 MB | 2021-05-01 |
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| G998NKSU3CVH7/G998NOKR3CVH7/G998NKOU3CVH1 | Odin | 227.6 MB | 2022-08-01 |
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| G998NKSU3AUF6/G998NOKR3AUF6/G998NKOU3AUF6 | Odin | 958.19 MB | 2021-06-01 |
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| G998NKSU3CVC5/G998NOKR3CVC5/G998NKOU3CVD1 | Odin | 1.32 GB | 2022-03-01 |
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| G998NKSS3CVI3/G998NOKR3CVI3/G998NKOU3CVH1 | Odin | 2.26 GB | 2022-09-01 |
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| G998NKSU3CVF2/G998NOKR3CVF2/G998NKOU3CVE9 | Odin | 607.67 MB | 2022-06-01 |
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| G998NKSU3DVL2/G998NOKR3DVL2/G998NKOU3DVL1 | Odin | 2.12 GB | 2022-12-01 |
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| G998NKSU3BVA2/G998NOKR3BVA2/G998NKOU3BVA1 | Odin | 1.98 GB | 2022-01-01 |
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| G998NKSU3EWB1/G998NOKR3EWB1/G998NKOU3EWA9 | Odin | 1.72 GB | 2023-02-01 |
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| G998NKSU3CVE1/G998NOKR3CVE1/G998NKOU3CVD9 | Odin | 1012.48 MB | 2022-05-01 |
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| G998NKSU3CVEB/G998NOKR3CVEB/G998NKOU3CVE9 | Odin | 610.62 MB | 2022-05-01 |
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| G998NKSU3CVDD/G998NOKR3CVDD/G998NKOU3CVD9 | Odin | 1 GB | 2022-04-01 |
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| G998NKSU3AUDA/G998NOKR3AUDA/G998NKOU3AUD9 | Odin | 1.04 GB | 2021-04-01 |
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| G998NKSU3DVJC/G998NOKR3DVJC/G998NKOU3DVJ8 | Odin | 2.18 GB | 2022-10-01 |
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| G998NKSU3DVKC/G998NOKR3DVKC/G998NKOU3DVK6 | Odin | 2.13 GB | 2022-11-01 |
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| G998NKSU3CVGB/G998NOKR3CVGB/G998NKOU3CVGB | Odin | 566.11 MB | 2022-07-01 |
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| G998NKSS3BULC/G998NOKR3BULC/G998NKOU3BUKF | Odin | 2.05 GB | 2021-12-01 |
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| G998NKSU3BULF/G998NOKR3BULF/G998NKOU3BULG | Odin | 1.98 GB | 2021-12-01 |
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| G998NKSU3BUKG/G998NOKR3BUKG/G998NKOU3BUKF | Odin | 2.03 GB | 2021-11-01 |
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| G998NKSS3AUIN/G998NOKR3AUIN/G998NKOU3AUIG | Odin | 23.68 MB | 2021-09-01 |
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| G998NKSU3AUIG/G998NOKR3AUIG/G998NKOU3AUIG | Odin | 231.65 MB | 2021-09-01 |
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| G998NKSU3AUHB/G998NOKR3AUHB/G998NKOU3AUHB | Odin | 285.06 MB | 2021-08-01 |
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| G998NKSU3AUGM/G998NOKR3AUGM/G998NKOU3AUGA | Odin | 903.94 MB | 2021-07-01 |
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| G998NKSU2AUC8/G998NOKR2AUC8/G998NKOU2AUC8 | Odin | 1.69 GB | 2021-03-01 |
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| G998NKSS2AUBB/G998NOKR2AUBB/G998NKOU2AUBB | Odin | 1.65 GB | 2021-02-01 |
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| G998NKSU1AUB9/G998NOKR1AUB9/G998NKOU1AUB7 | Odin | 1.65 GB | 2021-02-01 |
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| G998NKSU1AUA8/G998NOKR1AUA8/G998NKOU1AUA7 | Odin | 1.66 GB | 2021-01-01 |
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| G998NKSU1AUA4/G998NOKR1AUA4/G998NKOU1AUA4 | Odin | 1.66 GB | 2021-01-01 |
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| G998NKSU1AUB2/G998NOKR1AUB2/G998NKOU1AUB1 | Odin | 1.74 GB | 2021-02-01 |
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| G998NKSU1AUAB/G998NOKR1AUAB/G998NKOU1AUA9 | Odin | 1.67 GB | 2021-01-01 |
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| G998NKSU1ATLM/G998NOKR1ATLM/G998NKOU1ATLM | Odin | 1.89 GB | N/A |
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Versions: SM-G998B, SM-G998B/DS (International); SM-G998U (USA); SM-G998U1 (USA unlocked); SM-G998W (Canada); SM-G998N (Korea); SM-G9980 (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-G998U1 | |
| 1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28, 32, 38, 39, 40, 41, 66 - SM-G998B | ||
| 5G bands | 2, 5, 25, 41, 66, 71, 260, 261 SA/NSA/Sub6/mmWave - SM-G998U1 | |
| 1, 3, 5, 7, 8, 20, 28, 38, 40, 41, 66, 77, 78 SA/NSA/Sub6 - SM-G998B | ||
| 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 | 165.1 x 75.6 x 8.9 mm (6.5 x 2.98 x 0.35 in) |
|---|---|---|
| Weight | 227 g (Sub6), 229 g (mmWave) (8.01 oz) | |
| Build | Glass front (Gorilla Glass Victus), glass back (Gorilla Glass Victus), 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) Stylus support |
| Display | Type | Dynamic AMOLED 2X, 120Hz, HDR10+, 1500 nits (peak) |
|---|---|---|
| Size | 6.8 inches, 112.1 cm2 (~89.8% screen-to-body ratio) | |
| Resolution | 1440 x 3200 pixels, 20:9 ratio (~515 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 8GB RAM, 128GB 12GB RAM, 256GB 12GB RAM, 256GB 16GB RAM, 512GB 12GB RAM, 512GB 16GB RAM | |
| UFS 3.1 |
| Main Camera | Quad | 108 MP, f/1.8, 24mm (wide), 1/1.33", 0.8µm, PDAF, OIS 10 MP, f/2.4, 72mm (telephoto), 1/3.24", 1.22µm, dual pixel PDAF, OIS, 3x optical zoom 10 MP, f/4.9, 240mm (periscope telephoto), 1/3.24", 1.22µm, dual pixel PDAF, OIS, 10x optical zoom 12 MP, f/2.2, 13mm (ultrawide), 1/2.55", 1.4µm, dual pixel PDAF, Super Steady video |
|---|---|---|
| Features | Laser AF, 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 | 40 MP, f/2.2, 26mm (wide), 1/2.8", 0.7µm, PDAF |
|---|---|---|
| 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/6e, dual-band, Wi-Fi Direct |
|---|---|---|
| Bluetooth | 5.2, 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) Ultra Wideband (UWB) support |
| Battery | Type | Li-Ion 5000 mAh |
|---|---|---|
| Charging | 25W wired, PD3.0 15W wireless (Qi) 4.5W reverse wireless |
| Misc | Colors | Phantom Black, Phantom Silver, Phantom Titanium, Phantom Navy, Phantom Brown, Navy |
|---|---|---|
| Models | SM-G998B, SM-G998B/DS, SM-G998U, SM-G998U1, SM-G998W, SM-G998N, SM-G9980 | |
| SAR | 0.77 W/kg (head) 1.02 W/kg (body) | |
| SAR EU | 0.71 W/kg (head) 1.58 W/kg (body) | |
| Price | $ 244.44 / € 235.72 / £ 212.99 |
| Our Tests | Performance | AnTuTu: 657150 (v8) GeekBench: 3518 (v5.1) GFXBench: 33fps (ES 3.1 onscreen) |
|---|---|---|
| Display | 1023 nits max brightness (measured) | |
| Camera | Photo / Video | |
| Loudspeaker | -25.5 LUFS (Very good) | |
| Battery (old) | Endurance rating 114h | |
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 Ultra (Korea) 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.
