This Firmware flash for Samsung Galaxy S21 5G with the Model Number is SM-G991B. Firmware Region is Russia and CSC code is SER . Make sure the Model Number are correct with you device. You can check the Model Number in Setting - About phone (Model Number), If phone can't start you can find it by flipping your phone or among the things you found in the box. This Firmware PDA is G991BXXS3BUL1 with OS S(Android 12) and the Firmware are build on Fri 10 Dec 2021 11:37:21 am.

Download Firmware Samsung Galaxy S21 5G (SM-G991B)

AP Version: G991BXXS3BUL1
CSC Version: G991BOXM3BUKG
Android Version: S(Android 12)
Region: SER
Country: Russia
Binary: 3
Security patch level : 2021-12-01

Build Date: 2021-12-10 11:37:21
Size: 7.15 GB
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About Phone:

Samsung Galaxy S21 5G Android smartphone. Announced Jan 2021. Features 6.2″ display, Exynos 2100 chipset, 4000 mAh battery, 256 GB storage, 8 GB RAM, Corning Gorilla Glass Victus.

Admin Dec 14, 2021 SM-G991B, SER

What's new

• The security of your device has been improved.


Other Changes
- as part of the implementation of the requirements of the Decree of the Government of the Russian Federation No. 1867 of 18.11.2020, the download of mandatory applications has been added;
- some of these apps will only be installed if the device is reset to factory settings;
To learn more about the Decree of the Government of the Russian Federation No. 1867 of 18.11.2020, please follow the link http://publication.pravo.gov.ru/Document/View/0001202011230051
If you have any questions about downloading the required apps, please contact Samsung Electronics Customer Support via the feedback form on our website [https://www.samsung.com/ru/support/email/] or by phone 8-800-555-55-55 (free of charge from city and mobile phones of local mobile operators in Russia).

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How to flash firmware

Extract (unzip) the SM-G991B_SER_G991BXXS3BUL1......G991BXXS3BUL1.zip file. using WinRAR or 7-Zip.
Download Odin Tool 3.14.1
Extract Odin and open it.
Reboot Samsung Phone in Download Mode (hold Home + Power + Volume Down buttons / hold Volume Down + Bixby buttons then plug-in cable)
Connect you Samsung Phone and wait until you get a BLUE sign in Odin.
Add the 1 file Samsung firmware to AP/PDA or 4 files Samsung firmware (AP/BL/CP/CSC) to it's slots.
Do NOT tick any extra boxes. The only options to be ticked are F.Reset Time and Auto-Reboot.
Click the start button, wait for Odin to say 'PASS' in a GREEN sign. Once the flash is complete, your phone will reboot, and you can disconnect your phone from the PC.

The Samsung Galaxy S series is a line of high-end Android mobile devices produced by Samsung Electronics. The series consisted initially of smartphones and the first device, the Samsung Galaxy S, was announced in March 2010 and released for sale in June of that year.

Source: wikipedia.org

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