Flash firmware on Samsung Galaxy S21
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How to flash Samsung Galaxy S21?
Why reinstall the firmware?
Errors start to appear in the operating system.
Some installed applications stop opening.
Many programs from the Play Market do not start.
The phone restarts or shuts down randomly.
The phone began to work slowly.
The OS does not match the system requirements of the smartphone.
Where can I find the firmware?
On the official website of the phone manufacturer.
On specialized services where users post custom or official OS.
What should be done before installing the firmware?
Create a backup copy of user data, contacts and photos and transfer it to your computer.
Insert SD card. An SD card is needed to write firmware to it.
Find information about your smartphone model.
Fully charge your phone. If the battery runs out during boot, the device will no longer turn on.
Find and download the archive with Firmware.
Installing TWRP Recovery
Download and install the Official TWRP App from the Play Market.
When you start the application for the first time, you must agree to install a new firmware and all the risks associated with this, as well as agree to grant the application Superuser rights and click the 'OK' button.
On the next screen, select 'TWRP FLASH' and give the application root rights.
On the main screen of the application, select 'Select Device', and find your phone model.
After selecting a device, the program redirects the user to a web page to download the corresponding image file of the modified recovery environment. Download the suggested *.img file.
When the file is loaded, you need to return to the main screen of the Official TWRP App and press the 'Select a file to flash' button. Select the file downloaded in the previous step.
Press the 'FLASH TO RECOVERY' button and confirm your choice, press 'OK'.
When the message 'Flash Completed Succsessfuly!' appears on the screen. Click the 'OK' button. The TWRP installation procedure is now complete.
Copy the required files to the memory card. Using a PC or laptop card reader.
Insert a memory card into your phone.
To reboot into recovery, you need to use a special item in the Official TWRP App menu, accessible by pressing the button with three stripes in the upper left corner of the main screen of the application. We open the menu, select the 'Reboot' item, and then click on the 'REBOOT RECOVERY' button. The phone will reboot into the recovery environment automatically.
Firmware via TWRP
Before flashing, you need to delete all user data from the phone, this will avoid many problems. press 'WIPE' on the home screen.
Now you can start flashing. Click the 'Install' button.
The file selection screen appears. At the very top is the 'Storage' button, select the location where the firmware file is located.
Select the storage to which the files were copied.
Find the file we need and click on it. A screen opens with a warning about possible negative consequences, you need to check the item 'Zip signature verification', which will avoid using corrupted files when writing to the phone's memory sections.
The procedure for flashing the phone will begin, accompanied by the appearance of inscriptions in the log field and the movement of the progress bar.
The completion of the firmware installation procedure is indicated by the inscription 'Successful'.
Summary: Smart Phone OS: Android v10 (Q); CPU: Octa core (2.73 GHz, Dual core, M5 Mongoose 2.5 GHz, Dual core, Cortex A76 2 GHz, Quad core, Cortex A55); Chipset: Samsung Exynos 9 Octa 990; RAM: 12 GB; Internal Memory: 256 GB; External memory: Up to 1 TB; GPU: Mali-G77 MP11; SIM Size: SIM1: NanoSIM2: Nano (Hybrid); Height: 151.7 mm; Width: 71.2 mm; Thickness: 7.9 mm; Ruggedness: Dust proof; Waterproof: Water resistant, IP68; Screen Size: 6.2 inches (15.75 cm); Screen Resolution: 1440 x 3200 pixels; Screen Type: OLED; Pixel Density: 566 ppi; Protection: Corning Gorilla Glass v6; Touch Screen: Capacitive Touchscreen, Multi-touch; Camera: 16 MP Primary Camera64 MP Telephoto Camer ...
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