Samsung Galaxy S21 (USA unlocked) is a samsung device (codename: sm-g991u1). FirmwareMirror hosts 88 verified firmware builds, covering: ACG, PCT, LRA. Available as official firmware. Last updated: February 2026. All files MD5-verified. Free, no registration.
Find and download official Stock ROM for Samsung Galaxy S21 (USA unlocked) (sm-g991u1). 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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| G991U1UEU9FWL3/G991U1OYM9FWL3/G991U1UEU9FWL3 | Odin | 2.09 GB | 2023-12-01 |
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| G991U1UES9EWI3/G991U1OYM9EWI3/G991U1UES9EWI3 | Odin | 312.93 MB | 2023-09-01 |
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| G991U1UEU9EWL2/G991U1OYM9EWL2/G991U1UEU9EWL2 | Odin | 2.22 GB | 2023-12-01 |
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| G991U1UEU9EWI2/G991U1OYM9EWI2/G991U1UEU9EWI2 | Odin | 315.46 MB | 2023-09-01 |
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| G991U1UES9EWK2/G991U1OWA9EWI2/G991U1UES9EWK1 | Odin | 2.22 GB | 2023-11-01 |
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| G991U1UES9FXA1/G991U1OYM9FXA1/G991U1UES9FXA1 | Odin | 2.09 GB | 2024-01-01 |
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| G991U1UES9EWK1/G991U1OYM9EWK1/G991U1UES9EWK1 | Odin | 305.81 MB | 2023-11-01 |
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| G991U1UES9EWI1/G991U1OYM9EWI1/G991U1UES9EWI1 | Odin | 1.23 GB | 2023-09-01 |
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| G991U1UES8EWF6/G991U1OYM8EWF6/G991U1UES8EWF6 | Odin | 1.24 GB | 2023-06-01 |
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| G991U1UEU8EWF6/G991U1OWA8EWF6/G991U1UEU8EWF6 | Odin | 1.22 GB | 2023-06-01 |
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| G991U1UES8EWG3/G991U1OYM8EWG3/G991U1UES8EWG3 | Odin | 1.24 GB | 2023-07-01 |
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| G991U1UES8EWH2/G991U1OWA8EWF6/G991U1UEU8EWF6 | Odin | 1.22 GB | 2023-08-01 |
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| G991U1UEU7EWF4/G991U1OYM7EWF4/G991U1UEU7EWF4 | Odin | 1.25 GB | 2023-06-01 |
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| G991U1UES7EWE3/G991U1OWA7EWE3/G991U1UES7EWE2 | Odin | 1.24 GB | 2023-05-01 |
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| G991U1UES7EWE1/G991U1OYM7EWE1/G991U1UES7EWE1 | Odin | 301.24 MB | 2023-05-01 |
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| G991U1UESEGYA6/G991U1OWAEGYA6/G991U1UESEGYA6 | Odin | 3.28 GB | 2025-01-01 |
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| G991U1UEUCGXG6/G991U1OWACGXG6/G991U1UEUCGXG6 | Odin | 384.02 MB | 2024-07-01 |
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| G991U1UES6EWC9/G991U1OYM6EWC9/G991U1UES6EWC9 | Odin | 1.05 GB | 2023-03-01 |
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| G991U1UES6EWD6/G991U1OYM6EWD6/G991U1UES6EWD6 | Odin | 326.51 MB | 2023-04-01 |
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| G991U1UEU6EWD4/G991U1OWA6EWD4/G991U1UEU6EWD4 | Odin | 1.24 GB | 2023-04-01 |
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| G991U1UEU6EWD1/G991U1OYM6EWD1/G991U1UEU6EWD1 | Odin | 335.32 MB | 2023-04-01 |
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| G991U1UESEGYA5/G991U1OYMEGYA5/G991U1UESEGYA5 | Odin | 3.3 GB | 2025-01-01 |
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| G991U1UEU5CVH9/G991U1OYM5CVH9/G991U1UEU5CVH9 | Odin | 230.96 MB | 2022-08-01 |
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| G991U1UEU5CVG9/G991U1OYM5CVG9/G991U1UEU5CVG9 | Odin | 613.61 MB | 2022-07-01 |
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| G991U1UES5CVI8/G991U1OYM5CVI8/G991U1UES5CVI8 | Odin | 2.22 GB | 2022-09-01 |
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| G991U1UEU5CVE8/G991U1OYM5CVE8/G991U1UEU5CVE8 | Odin | 1011.53 MB | 2022-05-01 |
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| G991U1UES5BVA6/G991U1OYM5BVA6/G991U1UES5BVA6 | Odin | 2.09 GB | 2022-01-01 |
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| G991U1UES5EWB5/G991U1OYM5EWB5/G991U1UES5EWB5 | Odin | 1.05 GB | 2023-02-01 |
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| G991U1UES5CVF5/G991U1OYM5CVF5/G991U1UES5CVF5 | Odin | 621.81 MB | 2022-06-01 |
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| G991U1UES5DWA4/G991U1OYM5DWA4/G991U1UES5DWA4 | Odin | 1.63 GB | 2023-01-01 |
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| G991U1UEU5CVC4/G991U1OYM5CVC4/G991U1UEU5CVC4 | Odin | 1.14 GB | 2022-03-01 |
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| G991U1UEU5DVK3/G991U1OYM5DVK3/G991U1UEU5DVK3 | Odin | 1.63 GB | 2022-11-01 |
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| G991U1UES5DWB2/G991U1OYM5DWB2/G991U1UES5DWB2 | Odin | 1.63 GB | 2023-02-01 |
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| G991U1UES5DWA2/G991U1OYM5DWA2/G991U1UES5DWA2 | Odin | 1.63 GB | 2023-01-01 |
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| G991U1UEU5EWB1/G991U1OYM5EWB1/G991U1UEU5EWB1 | Odin | 1.05 GB | 2023-02-01 |
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| G991U1UEU5DVL1/G991U1OYM5DVL1/G991U1UEU5DVL1 | Odin | 1.62 GB | 2022-12-01 |
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| G991U1UEU5CVF1/G991U1OYM5CVF1/G991U1UEU5CVF1 | Odin | 625.12 MB | 2022-06-01 |
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| G991U1UES5BVC1/G991U1OYM5BVC1/G991U1UES5BVC1 | Odin | 2.09 GB | 2022-03-01 |
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| G991U1UES5CVLA/G991U1OWA5CVGB/G991U1UEU5CVGB | Odin | 2.24 GB | 2022-12-01 |
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| G991U1UES5CVIH/G991U1OWA5CVGB/G991U1UEU5CVGB | Odin | 228.9 MB | 2022-09-01 |
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| G991U1UES5CVHB/G991U1OYM5CVHB/G991U1UES5CVHB | Odin | 269.59 MB | 2022-08-01 |
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| G991U1UEU5CVGB/G991U1OYM5CVGB/G991U1UEU5CVGB | Odin | 610.37 MB | 2022-07-01 |
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| G991U1UEU5CVDC/G991U1OYM5CVDC/G991U1UEU5CVDC | Odin | 1011.52 MB | 2022-04-01 |
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| G991U1UES5CVCB/G991U1OYM5CVCB/G991U1UES5CVCB | Odin | 1.14 GB | 2022-03-01 |
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| G991U1UEU5BULH/G991U1OYM5BULH/G991U1UEU5BULH | Odin | 2.09 GB | 2021-12-01 |
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| G991U1UESEGXJ4/G991U1OYMEGXJ4/G991U1UESEGXJ4 | Odin | 334.57 MB | 2024-10-01 |
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| G991U1UES4AUH9/G991U1OYM4AUH9/G991U1UES4AUH9 | Odin | 274.09 MB | 2021-08-01 |
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| G991U1UEU4BUK7/G991U1OYM4BUK7/G991U1UEU4BUK7 | Odin | 1.89 GB | 2021-11-01 |
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| G991U1UES4AUJ7/G991U1OYM4AUJ7/G991U1UES4AUJ7 | Odin | 2.49 GB | 2021-10-01 |
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| G991U1UEU4AUI7/G991U1OYM4AUI7/G991U1UEU4AUI7 | Odin | 271.55 MB | 2021-09-01 |
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| G991U1UEU4AUF5/G991U1OYM4AUF5/G991U1UEU4AUF5 | Odin | 1.07 GB | 2021-06-01 |
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| G991U1UES4BULE/G991U1OYM4BULE/G991U1UES4BULE | Odin | 2.05 GB | 2021-12-01 |
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| G991U1UES4BUKK/G991U1OYM4BUKK/G991U1UES4BUKK | Odin | 2.05 GB | 2021-11-01 |
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| G991U1UEU4BUKF/G991U1OYM4BUKF/G991U1UEU4BUKF | Odin | 1.93 GB | 2021-11-01 |
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| G991U1UES4AUIN/G991U1OYM4AUIN/G991U1UES4AUIN | Odin | 257.89 MB | 2021-09-01 |
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| G991U1UEU4AUGQ/G991U1OYM4AUGQ/G991U1UEU4AUGQ | Odin | 278.65 MB | 2021-07-01 |
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| G991U1UEU4AUGE/G991U1OYM4AUGE/G991U1UEU4AUGE | Odin | 1.04 GB | 2021-07-01 |
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| G991U1UES4AUFD/G991U1OYM4AUFD/G991U1UES4AUFD | Odin | 1.07 GB | 2021-06-01 |
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| G991U1UESDGXJ3/G991U1OWADGXJ3/G991U1UESDGXJ3 | Odin | 365.18 MB | 2024-10-01 |
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| G991U1UESCGXF3/G991U1OYMCGXF3/G991U1UESCGXF3 | Odin | 339.29 MB | 2024-06-01 |
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| G991U1UESAFXB3/G991U1OWAAFXB3/G991U1UESAFXB3 | Odin | 2.08 GB | 2024-02-01 |
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| G991U1UES3AUE3/G991U1OYM3AUE3/G991U1UES3AUE3 | Odin | 1.12 GB | 2021-05-01 |
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| G991U1UEU3AUDD/G991U1OYM3AUDD/G991U1UEU3AUDD | Odin | 1.12 GB | 2021-04-01 |
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| G991U1UESHHYI2/G991U1OYMHHYI2/G991U1UESHHYI2 | Odin | 332.1 MB | 2025-09-01 |
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| G991U1UESBGXE2/G991U1OWABGXE1/G991U1UESBGXE1 | Odin | 521.53 MB | 2024-05-01 |
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| G991U1UEU2AUC8/G991U1OYM2AUC8/G991U1UEU2AUC8 | Odin | 1.53 GB | 2021-03-01 |
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| G991U1UEU2AUB6/G991U1OYM2AUB6/G991U1UEU2AUB6 | Odin | 1.87 GB | 2021-02-01 |
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| G991U1UESJHZB1/G991U1OYMJHZB1/G991U1UESJHZB1 | Odin | 2.24 GB | 2026-02-01 |
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| G991U1UESIHYL1/G991U1OYMIHYL1/G991U1UESIHYL1 | Odin | 318.24 MB | 2025-12-01 |
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| G991U1UESGHYF1/G991U1OYMGHYF1/G991U1UESGHYF1 | Odin | 339.66 MB | 2025-06-01 |
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| G991U1UESFHYE1/G991U1OYMFHYE1/G991U1UESFHYE1 | Odin | 316.32 MB | 2025-05-01 |
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| G991U1UESEGXL1/G991U1OYMEGXL1/G991U1UESEGXL1 | Odin | 309.46 MB | 2024-12-01 |
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| G991U1UESDGXJ1/G991U1OYMDGXJ1/G991U1UESDGXJ1 | Odin | 308.51 MB | 2024-10-01 |
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| G991U1UESCGXH1/G991U1OYMCGXH1/G991U1UESCGXH1 | Odin | 314.84 MB | 2024-08-01 |
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| G991U1UESBGXF1/G991U1OYMBGXF1/G991U1UESBGXF1 | Odin | 347.61 MB | 2024-06-01 |
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| G991U1UESBGXE1/G991U1OYMBGXE1/G991U1UESBGXE1 | Odin | 356.05 MB | 2024-05-01 |
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| G991U1UESAFXD1/G991U1OYMAFXD1/G991U1UESAFXD1 | Odin | 2.09 GB | 2024-04-01 |
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| G991U1UEU1AUA3/G991U1OYM1AUA3/G991U1UEU1AUA3 | Odin | 1.87 GB | 2021-01-01 |
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| G991U1UEU1AUAG/G991U1OYM1AUAG/G991U1UEU1AUAG | Odin | 1.87 GB | 2021-01-01 |
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| G991U1UEU1ATLI/G991U1OYM1ATLI/G991U1UEU1ATLI | Odin | 1.98 GB | N/A |
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| G991U1UESJHZAA/G991U1OYMJHZAA/G991U1UESJHZAA | Odin | 1.1 GB | 2026-01-01 |
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| G991U1UEUEHYDA/G991U1OYMEHYDA/G991U1UEUEHYDA | Odin | 326.49 MB | 2025-04-01 |
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| G991U1UESEGXLB/G991U1OYMEGXLB/G991U1UESEGXLB | Odin | 309.65 MB | 2024-12-01 |
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| G991U1UESEGXLC/G991U1OWAEGXLC/G991U1UESEGXLC | Odin | 308.23 MB | 2024-12-01 |
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| G991U1UEUCGXGB/G991U1OYMCGXGB/G991U1UEUCGXGB | Odin | 309.19 MB | 2024-07-01 |
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| G991U1UEUAGXDE/G991U1OYMAGXDE/G991U1UEUAGXDE | Odin | 360.07 MB | 2024-04-01 |
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| G991U1UESAFXBC/G991U1OYMAFXBC/G991U1UESAFXBC | Odin | 2.09 GB | 2024-02-01 |
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| G991U1UESAFXAB/G991U1OYMAFXAB/G991U1UESAFXAB | Odin | 2.09 GB | 2024-01-01 |
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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 |
|---|---|---|
| Features | HDR | |
| Video | 4K@30/60fps, 1080p@30fps |
| Sound | Loudspeaker | Yes, with stereo speakers |
|---|---|---|
| 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 (USA unlocked) 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.
