Samsung Galaxy S21 is a samsung device (codename: sm-g991b). FirmwareMirror hosts 139 verified firmware builds, covering: 3IE, XSA, ACR, AMO, ARO. Available as official firmware. Last updated: March 2026. All files MD5-verified. Free, no registration.
Find and download official Stock ROM for Samsung Galaxy S21 (sm-g991b). All firmware files include MD5 hash verification and are available for direct download.
| Version | Method | Size | Release Date | MD5 Hash | Download |
|---|---|---|---|---|---|
| G991BXXS9FWL9/G991BOXM9FWK2/G991BXXU9FWK2 | Odin | 2.19 GB | 2023-12-01 |
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| G991BXXU9EWI7/G991BOWO9EWI7/G991BXXU9EWI6 | Odin | 232.49 MB | 2023-09-01 |
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| G991BXXU9EWI7/G991BOWE9EWI6/G991BXXU9EWI6 | Odin | 274.17 MB | 2023-09-01 |
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| G991BXXU9EWH5/G991BOXM9EWH9/G991BXXU9EWH6 | Odin | 245.87 MB | 2023-08-01 |
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| G991BXXS9FWL5/G991BOXM9FWK5/G991BXXU9FWK5 | Odin | 2.2 GB | 2023-12-01 |
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| G991BXXU9FWK5/G991BOXM9FWK5/G991BXXU9FWK5 | Odin | 2.2 GB | 2023-11-01 |
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| G991BXXU9EWH5/G991BOXM9EWH5/G991BXXU9EWH5 | Odin | 263.52 MB | 2023-08-01 |
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| G991BXXS9FWL4/G991BOXM9FWK3/G991BXXU9FWK2 | Odin | 2.2 GB | 2023-12-01 |
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| G991BXXU9FWK4/G991BOWO9FWL2/G991BXXU9FWK2 | Odin | 266.33 MB | 2023-11-01 |
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| G991BXXU9FWL3/G991BOXM9FWL3/G991BXXU9FWL3 | Odin | 2.2 GB | 2023-12-01 |
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| G991BXXS9EWI3/G991BOWE9EWI3/G991BXXS9EWI3 | Odin | 1.15 GB | 2023-09-01 |
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| G991BXXS9EWF3/G991BOXM9EWF3/G991BXXS9EWF3 | Odin | 1.13 GB | 2023-06-01 |
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| G991BXXS9FXA3/G991BOXM9FXA3/G991BXXU9FWK2 | Odin | 2.19 GB | 2024-01-01 |
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| G991BXXU9FWK3/G991BOXM9FWK3/G991BXXU9FWK2 | Odin | 2.2 GB | 2023-11-01 |
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| G991BXXS9EWI3/G991BOWO9EWF2/G991BXXS9EWI3 | Odin | 1.24 GB | 2023-09-01 |
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| G991BXXS9FXA2/G991BOXM9FWK5/G991BXXU9FWK5 | Odin | 2.19 GB | 2024-01-01 |
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| G991BXXU9FWK2/G991BOXM9FWK2/G991BXXU9FWK2 | Odin | 2.2 GB | 2023-11-01 |
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| G991BXXS9EWI1/G991BOXM9EWH9/G991BXXU9EWH6 | Odin | 240.56 MB | 2023-09-01 |
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| G991BXXS9EWI1/G991BOXM9EWH5/G991BXXU9EWH5 | Odin | 258.22 MB | 2023-09-01 |
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| G991BXXS9EWH1/G991BOXM9EWH1/G991BXXS9EWG9 | Odin | 1.13 GB | 2023-08-01 |
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| G991BXXS9EWIA/G991BOXM9EWH9/G991BXXU9EWH6 | Odin | 235.44 MB | 2023-09-01 |
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| G991BXXS9EWJO/G991BOXM9EWH9/G991BXXS9EWJR | Odin | 2.23 GB | 2023-10-01 |
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| G991BXXS9EWJH/G991BOWO9EWI7/G991BXXS9EWJH | Odin | 232.34 MB | 2023-10-01 |
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| G991BXXS9EWJQ/G991BOWO9EWI7/G991BXXS9EWJH | Odin | 2.32 GB | 2023-10-01 |
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| G991BXXS9FXAM/G991BOXM9FWK5/G991BXXU9FWK5 | Odin | 2.19 GB | 2024-01-01 |
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| G991BXXS9EWJG/G991BOXM9EWH5/G991BXXU9EWH5 | Odin | 253.04 MB | 2023-10-01 |
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| G991BXXS9EWIA/G991BOXM9EWH5/G991BXXU9EWH5 | Odin | 253.09 MB | 2023-09-01 |
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| G991BXXS9FXAK/G991BOXM9FWL3/G991BXXU9FWL3 | Odin | 2.19 GB | 2024-01-01 |
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| G991BXXS9FWLA/G991BOXM9FWL3/G991BXXU9FWL3 | Odin | 2.19 GB | 2023-12-01 |
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| G991BXXS9FXAH/G991BOXM9FWK2/G991BXXU9FWK2 | Odin | 2.19 GB | 2024-01-01 |
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| G991BXXS9FXAJ/G991BOWO9FWL2/G991BXXU9FWK2 | Odin | 2.06 GB | 2024-01-01 |
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| G991BXXS9FWLD/G991BOWO9FWL2/G991BXXU9FWK2 | Odin | 2.07 GB | 2023-12-01 |
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| G991BXXS9FWKB/G991BOXM9FWK2/G991BXXU9FWK2 | Odin | 2.2 GB | 2023-11-01 |
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| G991BXXS9FXBH/G991BOWO9FWL2/G991BXXS9FXBD | Odin | 2.1 GB | 2024-02-01 |
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| G991BXXS9FXAI/G991BOXM9FXAI/G991BXXU9FWK2 | Odin | 2.19 GB | 2024-01-01 |
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| G991BXXS9FXBD/G991BOXM9FXBD/G991BXXS9FXBD | Odin | 2.19 GB | 2024-02-01 |
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| G991BXXS9FXBE/G991BOXM9FXBE/G991BXXS9FXBE | Odin | 2.19 GB | 2024-02-01 |
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| G991BXXS9FXBF/G991BOXM9FXBF/G991BXXS9FXBD | Odin | 2.19 GB | 2024-02-01 |
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| G991BXXS9FXBG/G991BOXM9FXBG/G991BXXS9FXBG | Odin | 2.19 GB | 2024-02-01 |
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| G991BXXS9EWJO/G991BOXM9EWJO/G991BXXS9EWJO | Odin | 2.23 GB | 2023-10-01 |
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| G991BXXS9EWJQ/G991BOWE9EWJP/G991BXXS9EWJH | Odin | 2.19 GB | 2023-10-01 |
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| G991BXXSCGXH8/G991BOWOCGXH5/G991BXXUCGXGC | Odin | 398.74 MB | 2024-08-01 |
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| G991BXXU8EWF1/G991BOXM8EWF1/G991BXXU8EWF1 | Odin | 1.15 GB | 2023-06-01 |
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| G991BXXUBGXE7/G991BOXMBGXE7/G991BXXUBGXE7 | Odin | 580.62 MB | 2024-05-01 |
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| G991BXXSCGXH7/G991BOXMCGXGC/G991BXXUCGXGC | Odin | 516.98 MB | 2024-08-01 |
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| G991BXXU7EWE6/G991BOXM7EWE6/G991BXXU7EWE1 | Odin | 1.17 GB | 2023-05-01 |
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| G991BXXS7EWC4/G991BOWO7EWC4/G991BXXS7EWC4 | Odin | 1.08 GB | 2023-03-01 |
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| G991BXXS7EWD3/G991BOXM7EWD3/G991BXXS7EWD3 | Odin | 1.25 GB | 2023-04-01 |
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| G991BXXS7EWE2/G991BOWO7EWCK/G991BXXS7EWE2 | Odin | 477.9 MB | 2023-05-01 |
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| G991BXXU7EWE1/G991BOXM7EWE1/G991BXXU7EWE1 | Odin | 1.17 GB | 2023-05-01 |
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| G991BXXU7EWCH/G991BOXM7EWCH/G991BXXU7EWCH | Odin | 1.25 GB | 2023-03-01 |
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| G991BXXSJHZA6/G991BOXMJHZA6/G991BXXSJHZA6 | Odin | 303.52 MB | 2026-01-01 |
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| G991BXXSDGXI6/G991BOWEDGXI6/G991BXXSDGXI5 | Odin | 392.11 MB | 2024-09-01 |
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| G991BXXSDGXI6/G991BOWODGXI6/G991BXXSDGXI5 | Odin | 393.51 MB | 2024-09-01 |
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| G991BXXS6DWA6/G991BOWO6DVL6/G991BXXS6DWA5 | Odin | 1.42 GB | 2023-01-01 |
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| G991BXXS6DWB2/G991BOWO6DVL6/G991BXXS6DWA5 | Odin | 1.56 GB | 2023-02-01 |
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| G991BXXS6EWBB/G991BOXM6EWB5/G991BXXU6EWAF | Odin | 1.52 GB | 2023-02-01 |
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| G991BXXU6EWAF/G991BOXM6EWB5/G991BXXU6EWAF | Odin | 1.52 GB | 2023-01-01 |
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| G991BXXS6EWBB/G991BOXM6EWAF/G991BXXU6EWAF | Odin | 1.52 GB | 2023-02-01 |
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| G991BXXU6EWAF/G991BOXM6EWAF/G991BXXU6EWAF | Odin | 1.52 GB | 2023-01-01 |
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| G991BXXUEHYD5/G991BOXMEHYD5/G991BXXUEHYD5 | Odin | 340.99 MB | 2025-04-01 |
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| G991BXXSDGXI5/G991BOXMDGXI5/G991BXXSDGXI5 | Odin | 508.8 MB | 2024-09-01 |
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| G991BXXSCGXF5/G991BOXMCGXF5/G991BXXSCGXF5 | Odin | 575.29 MB | 2024-06-01 |
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| G991BXXUCGXH5/G991BOWECGXH5/G991BXXUCGXGC | Odin | 399.7 MB | 2024-08-01 |
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| G991BXXUCGXH5/G991BOWOCGXH5/G991BXXUCGXGC | Odin | 385.7 MB | 2024-08-01 |
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| G991BXXU5CVH7/G991BOXM5CVH7/G991BXXU5CVH7 | Odin | 217.59 MB | 2022-08-01 |
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| G991BXXS5DWA7/G991BOXM5DWA3/G991BXXU5DVL2 | Odin | 1.99 GB | 2023-01-01 |
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| G991BXXU5CVI6/G991BOWE5CVI6/G991BXXU5CVI6 | Odin | 1.96 GB | 2022-09-01 |
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| G991BXXU5CVI6/G991BOWO5CVI6/G991BXXU5CVI6 | Odin | 1.99 GB | 2022-09-01 |
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| G991BXXS5DWA4/G991BOXM5DVKF/G991BXXU5DVL2 | Odin | 1.99 GB | 2023-01-01 |
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| G991BXXU5DWA3/G991BOXM5DWA3/G991BXXU5DVL2 | Odin | 2.06 GB | 2023-01-01 |
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| G991BXXU5DVK3/G991BOXM5DVK3/G991BXXU5DVJA | Odin | 1.97 GB | 2022-11-01 |
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| G991BXXS5DVL3/G991BOXM5DVKF/G991BXXU5DVL2 | Odin | 1.96 GB | 2022-12-01 |
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| G991BXXU5DVL2/G991BOWO5DVL5/G991BXXU5DVL1 | Odin | 1.44 GB | 2022-12-01 |
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| G991BXXU5CVF1/G991BOXM5CVF1/G991BXXU5CVF3 | Odin | 667.44 MB | 2022-06-01 |
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| G991BXXS5DVK1/G991BOXM5DVJC/G991BXXU5DVJA | Odin | 2.08 GB | 2022-11-01 |
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| G991BXXS5CVIF/G991BOXM5CVH7/G991BXXU5CVH7 | Odin | 2.02 GB | 2022-09-01 |
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| G991BXXS5CVHI/G991BOXM5CVH7/G991BXXU5CVH7 | Odin | 217.34 MB | 2022-08-01 |
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| G991BXXU5CVGC/G991BOWO5CVG7/G991BXXU5CVG3 | Odin | 763.53 MB | 2022-07-01 |
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| G991BXXS5DVKE/G991BOXM5DVK3/G991BXXU5DVJA | Odin | 2 GB | 2022-11-01 |
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| G991BXXU5CVGB/G991BOXM5CVGB/G991BXXU5CVG3 | Odin | 595.29 MB | 2022-07-01 |
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| G991BXXS5CVFB/G991BOXM5CVFB/G991BXXU5CVF3 | Odin | 660.58 MB | 2022-06-01 |
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| G991BXXU5DVKF/G991BOXM5DVKF/G991BXXU5DVL2 | Odin | 1.99 GB | 2022-11-01 |
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| G991BXXU5DVJC/G991BOXM5DVJC/G991BXXU5DVJA | Odin | 2.08 GB | 2022-10-01 |
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| G991BXXS5CVEA/G991BOWO5CVDD/G991BXXU5CVDD | Odin | 1.17 GB | 2022-05-01 |
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| G991BXXU5CVDD/G991BOXM5CVDD/G991BXXU5CVDD | Odin | 1.07 GB | 2022-04-01 |
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| G991BXXSCGXF4/G991BOXMCGXF6/G991BXXSCGXF4 | Odin | 579.97 MB | 2024-06-01 |
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| G991BXXSBGXE4/G991BOWEBGXE4/G991BXXSBGXDH | Odin | 563.1 MB | 2024-05-01 |
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| G991BXXS4BVA8/G991BOXM4BULF/G991BXXU4BULG | Odin | 2.18 GB | 2022-01-01 |
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| G991BXXU4CVC4/G991BOXM4CVC4/G991BXXU4CVC2 | Odin | 1.24 GB | 2022-03-01 |
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| G991BXXU4CVD2/G991BOXM4CVD2/G991BXXU4CVC2 | Odin | 1.23 GB | 2022-04-01 |
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| G991BXXU4BVB1/G991BOXM4BVB1/G991BXXU4BVB1 | Odin | 2.12 GB | 2022-02-01 |
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| G991BXXS4CVCG/G991BOWO4CVB9/G991BXXU4CVC2 | Odin | 1.34 GB | 2022-03-01 |
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| G991BXXS4BVAA/G991BOWO4BULG/G991BXXU4BULG | Odin | 1.7 GB | 2022-01-01 |
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| G991BXXU4BULF/G991BOXM4BULF/G991BXXU4BULG | Odin | 2.18 GB | 2021-12-01 |
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| G991BXXU3BUK8/G991BOXM3BUK8/G991BXXU3BUK8 | Odin | 2.15 GB | 2021-11-01 |
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| G991BXXS3AUJ7/G991BOXM3AUIE/G991BXXU3AUIF | Odin | 2.52 GB | 2021-10-01 |
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| G991BXXU3AUF6/G991BOXM3AUF6/G991BXXU3AUF9 | Odin | 998.47 MB | 2021-06-01 |
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| G991BXXS3BUL6/G991BOXM3BUKG/G991BXXU3BUKG | Odin | 2.16 GB | 2021-12-01 |
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| G991BXXU3AUG4/G991BOXM3AUG4/G991BXXU3AUG4 | Odin | 960.91 MB | 2021-07-01 |
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| G991BXXU3AUE1/G991BOXM3AUE1/G991BXXU3AUE1 | Odin | 1.1 GB | 2021-05-01 |
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| G991BXXS3BUL1/G991BOXM3BUKG/G991BXXU3BUKG | Odin | 2.17 GB | 2021-12-01 |
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| G991BXXS3AUFD/G991BOXM3AUF6/G991BXXU3AUF9 | Odin | 997.67 MB | 2021-06-01 |
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| G991BXXS3BULC/G991BOXM3BUKG/G991BXXU3BUKG | Odin | 2.2 GB | 2021-12-01 |
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| G991BXXU3BUKA/G991BOXM3BUKA/G991BXXU3BUKB | Odin | 2.15 GB | 2021-11-01 |
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| G991BXXU3BUKG/G991BOXM3BUKG/G991BXXU3BUKG | Odin | 2.24 GB | 2021-11-01 |
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| G991BXXU3AUIE/G991BOXM3AUIE/G991BXXU3AUIF | Odin | 210.33 MB | 2021-09-01 |
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| G991BXXS3AUHD/G991BOXM3AUHB/G991BXXU3AUHB | Odin | 307.49 MB | 2021-08-01 |
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| G991BXXU3AUHB/G991BOXM3AUHB/G991BXXU3AUHB | Odin | 307.26 MB | 2021-08-01 |
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| G991BXXU3AUGM/G991BOXM3AUGM/G991BXXU3AUGM | Odin | 934.69 MB | 2021-07-01 |
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| G991BXXSJHZC2/G991BOXMJHZC2/G991BXXSJHZA6 | Odin | 1.91 GB | 2026-03-01 |
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| G991BXXSEGYA2/G991BOXMEGXL2/G991BXXSEGXL2 | Odin | 3.29 GB | 2025-01-01 |
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| G991BXXSEGXL2/G991BOXMEGXL2/G991BXXSEGXL2 | Odin | 248.65 MB | 2024-12-01 |
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| G991BXXU2AUC8/G991BOXM2AUC8/G991BXXU2AUC8 | Odin | 1.72 GB | 2021-03-01 |
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| G991BXXS2AUBB/G991BOXM2AUBB/G991BXXU2AUBB | Odin | 1.98 GB | 2021-02-01 |
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| G991BXXSIHYK1/G991BOXMIHYK1/G991BXXSIHYK1 | Odin | 281.1 MB | 2025-11-01 |
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| G991BXXSHHYJ1/G991BOXMHHYJ1/G991BXXSHHYJ1 | Odin | 292.58 MB | 2025-10-01 |
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| G991BXXSGHYH1/G991BOXMGHYH1/G991BXXSGHYH1 | Odin | 307.3 MB | 2025-08-01 |
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| G991BXXSFHYE1/G991BOXMFHYE1/G991BXXSFHYE1 | Odin | 323.51 MB | 2025-05-01 |
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| G991BXXSEGXK1/G991BOXMEGXJE/G991BXXUEGXJE | Odin | 282.28 MB | 2024-11-01 |
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| G991BXXU1AUB8/G991BOXM1AUB8/G991BXXU1AUB8 | Odin | 1.99 GB | 2021-02-01 |
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| G991BXXU1AUB6/G991BOXM1AUB6/G991BXXU1AUB7 | Odin | 1.98 GB | 2021-02-01 |
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| G991BXXU1AUA4/G991BOXM1AUA4/G991BXXU1AUA4 | Odin | 1.99 GB | 2021-01-01 |
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| G991BXXU1AUB3/G991BOXM1AUB3/G991BXXU1AUB3 | Odin | 2.04 GB | 2021-02-01 |
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| G991BXXU1AUAB/G991BOXM1AUAB/G991BXXU1AUAB | Odin | 2.07 GB | 2021-01-01 |
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| G991BXXU1ATLD/G991BOXM1ATLD/G991BXXU1ATLD | Odin | 2.08 GB | N/A |
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| G991BXXSAFXCQ/G991BOWOAFWL2/G991BXXSAFXCL | Odin | 2.1 GB | 2024-03-01 |
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| G991BXXUEGXJE/G991BOXMEGXJE/G991BXXUEGXJE | Odin | 290.11 MB | 2024-10-01 |
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| G991BXXUCGXGC/G991BOXMCGXGC/G991BXXUCGXGC | Odin | 516.23 MB | 2024-07-01 |
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| G991BXXSBGXEC/G991BOXMBGXEE/G991BXXSBGXEC | Odin | 579.23 MB | 2024-05-01 |
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| G991BXXSBGXED/G991BOXMBGXED/G991BXXSBGXED | Odin | 578.06 MB | 2024-05-01 |
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| G991BXXSBGXDH/G991BOXMBGXDG/G991BXXSBGXDH | Odin | 585.55 MB | 2024-04-01 |
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| G991BXXSBGXDH/G991BOXMBGXDH/G991BXXSBGXDH | Odin | 585.48 MB | 2024-04-01 |
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| G991BXXUAGXDA/G991BOXMAGXDA/G991BXXUAGXDA | Odin | 582.15 MB | 2024-04-01 |
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| G991BXXUAGXDA/G991BOXMAGXDC/G991BXXUAGXDA | Odin | 582.2 MB | 2024-04-01 |
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| G991BXXSAFXCL/G991BOXMAFXCL/G991BXXSAFXCL | Odin | 2.19 GB | 2024-03-01 |
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| G991BXXSAFXCM/G991BOXMAFXCM/G991BXXSAFXCM | Odin | 2.19 GB | 2024-03-01 |
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| G991BXXSAFXCO/G991BOXMAFXCO/G991BXXSAFXCO | Odin | 2.19 GB | 2024-03-01 |
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| G991BXXSAFXCP/G991BOXMAFXCP/G991BXXSAFXCL | Odin | 2.19 GB | 2024-03-01 |
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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 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.
