Flash firmware on Samsung Galaxy M21
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How to flash Samsung Galaxy M21?
Why reinstall the firmware?
Errors start to appear in the operating system.
Some applications stop opening.
Many applications from the Play Market do not start.
The phone shuts down and restarts for no apparent reason.
The phone is slow.
The OS does not match the system requirements of the smartphone.
Where can I find the firmware?
On the official website of the manufacturer.
On Internet resources where users post custom or official OS.
What should be done before installing the firmware?
Back up your contacts and user data and transfer it to another medium.
Insert your SD card into your phone. It must have enough memory to fit the firmware.
Find information about your smartphone model.
Fully charge your device's battery.
Download archive with Firmware.
Installing TWRP Recovery
Download the Official TWRP App to your phone from the Play Market. And install this app.
When you start the application for the first time, you must consent to future manipulations, as well as consent to granting the application Superuser rights. Check the checkboxes and press the 'OK' button.
In the next screen, select the item 'TWRP FLASH' and provide the application with root-rights.
On the main screen of the application, select 'Select Device', and find your phone model.
After selecting the phone, the application will redirect the user to a web page to download the modified recovery environment image file. Download the proposed *.img file.
After downloading the image file, return to the main screen of the Official TWRP App and press the 'Select a file to flash' button. Then we tell the program the path where the file loaded in the previous step is located.
After adding the image file to the program, click the 'FLASH TO RECOVERY' button and confirm your choice, click 'OK'.
After the burn process is complete, the message 'Flash Completed Succsessfuly!' appears. Click 'OK'. The TWRP installation procedure can be considered complete..
Copy the necessary files to the SD memory card. Using a PC or laptop card reader.
Insert a memory card into the 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 clear the 'Cache' and 'Data' sections, press 'WIPE' on the main screen. This will delete all user data from the device, but avoid a wide range of software errors and other problems.
Now you can start flashing. Click the 'Install' button.
The file selection screen is displayed. At the very top is the 'Storage' button, select the location where the firmware file is located.
Select the location where you copied the files.
Find the file we need and click on it. A screen opens with a warning about possible negative consequences, as well as the item 'Zip signature verification'. This item should be checked by placing a cross in the check-box, which will avoid using damaged files when writing to the phone's memory sections.
The procedure for writing files to the device's memory will begin, accompanied by the appearance of inscriptions in the log field and the completion of the progress bar.
The completion of the firmware installation procedure is indicated by the inscription 'Successful'.
Summary: Operating system: Android 10, One UI 2; Processor: Octa-core (4x2.3 GHz Cortex-A73 & 4x1.7 GHz Cortex-A53); Chipset: Exynos 9611 (10nm); GPU: Mali-G72 MP3; Internal memory: 64GB 4GB RAM, 128GB 6GB RAM; External memory: microSDXC (dedicated slot); Type: Super AMOLED capacitive touchscreen, 16M colors; Size: 6.4 inches, 100.5 cm 2; Resolution: 1080 x 2340 pixels, 19.5:9 ratio; Protection: Corning Gorilla Glass 3; Body build: Glass front (Gorilla Glass 3), plastic back, plastic frame; SIM: Dual SIM (Nano-SIM, dual stand-by); Dimensions: 159 x 75.1 x 8.9 mm (6.26 x 2.96 x 0.35 in); Weight: 188 g (6.63 oz); Colors: Midnight Blue, Raven Black; 2G Network: GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM ...
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