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 Download Samsung Galaxy S21 SM-G991U1 - ATT - G991U1UEUCGXGB

Download the firmware flash for Samsung Galaxy S21 with the code is SM-G991U1. This firmware for the region with CSC code is ATT (ATT - United States). Please make sure the code is correct. You can check model code in Setting - About, in Download mode or you can find it by flipping your phone or among the things you found in the box. This product PDA version is G991U1UEUCGXGB and Android version is U(Android 14). This firmware size is 7.34 GB.

This firmware is official from Samsung Cloud Server. Of course, we recommend you are using official Samsung tool like Samsung Smart Switch or Samsung Kies. Samfw.com will not responsible for any damage caused by using the files on this website

  • AP VERSION G991U1UEUCGXGB
  • CSC VERSION G991U1OYMCGXGB
  • ANDROID VERSION U(Android 14)
  • BIT (BINARY/U/SW REV.) C
  • SIZE 7.34 GB  Full Files
  • MD5 fe45ead779569935bf28785939be217b
• Stability and reliability
Device behavior has been improved.
• Security
The device is protected with improved security.
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Child files of G991U1UEUCGXGB - If you want to download full firmware. Download one file ABOVE instead download all child files
Download Filename Download/Size MD5
AP_G991U1UEUCGXGB_G991U1UEUCGXGB_MQB83538140_REV00_user_low_ship_MULTI_CERT_meta_OS14.tar.md5.zip 19 dl
7.03 GB 		MD5
BL_G991U1UEUCGXGB_G991U1UEUCGXGB_MQB83538140_REV00_user_low_ship_MULTI_CERT.tar.md5.zip 9 dl
78.22 MB 		MD5
CP_G991U1UEUCGXGB_CP27089997_MQB83538140_REV00_user_low_ship_MULTI_CERT.tar.md5.zip 7 dl
55.68 MB 		MD5
CSC_OYM_G991U1OYMCGXGB_MQB83538140_REV00_user_low_ship_MULTI_CERT.tar.md5.zip 5 dl
56.84 MB 		MD5
HOME_CSC_OYM_G991U1OYMCGXGB_MQB83538140_REV00_user_low_ship_MULTI_CERT.tar.md5.zip 5 dl
56.82 MB 		MD5
 Recent posts
 How to flash Samsung Galaxy S21 SM-G991U1 firmware

1. Extract (unzip) the Samsung firmware file. Recommended using WinRAR or 7-Zip

2. Download Odin Tool 3.13.1

3. Extract Odin ZIP file

4. Open Odin execute file

5. Reboot Samsung phone in Download Mode (hold Home + Power + Volume Down buttons / hold Volume Down + Bixby buttons then plug-in cable)

6. Connect you Samsung phone and wait until you get a blue sign in Odin

7. Add the 1 file Samsung firmware to AP/PDA or 4 files Samsung firmware (AP/BL/CP/CSC) to it's slots

8. Make sure re-partition is NOT ticked

9. Click the START button, sit back and wait few minutes

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