Flash firmware on Samsung Galaxy F21
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How to flash Samsung Galaxy F21?
Why reinstall the firmware?
Errors constantly appear in the Android OS.
Some installed applications stop opening.
Some applications from the Play Market do not start.
The phone restarts by itself for no reason.
The phone began to work slowly.
You are not satisfied with the possibilities of the stock firmware.
Where can I find the firmware?
On the phone manufacturer's website.
On certain sites where developers post custom or official OS.
What should be done before installing the firmware?
Create a backup copy of user data and transfer it to your computer.
Insert your SD card into your phone. It must have enough memory to fit the firmware.
Determine 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. And place it on the SD card.
Installing TWRP Recovery
Install the Official TWRP App via the Play Market. And run this application.
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.
Going to the next screen, select the item 'TWRP FLASH' and provide the application with root-rights.
On the main screen of the application, click 'Select Device', and select 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.
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.
Press the 'FLASH TO RECOVERY' button and confirm your choice.
When the message 'Flash Completed Succsessfuly!' appears on the screen. Click the 'OK' button. The TWRP installation procedure is now complete.
Transfer the necessary files to the SD card. Using a PC or laptop card reader.
Insert a SD memory card into the phone.
To reboot into recovery, you need to enter the menu accessible by pressing the button with three stripes in the upper left corner of the main screen of the application. Select 'Reboot' and then click on the 'REBOOT RECOVERY' button.
Firmware via TWRP
Before flashing, it is recommended to clear the 'Cache' and 'Data' sections. This will delete all user data from the device, but avoid a wide range of software errors and other problems. You must press 'WIPE' on the main screen.
You can start flashing. Click the 'Install' button.
The file selection screen appears. At the very top there is a 'Storage' button for selecting an SD card.
Select the location where you copied the files. Press the OK button.
Select the firmware file 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 writing files to the phone's memory will begin, accompanied by logging and filling in the progress bar.
After the firmware installation procedure is completed, the 'Successful' message appears on the screen.
Summary: Smart Phone OS: Android v11; CPU: Octa core (2.2 GHz, Dual core, Kryo 470 1.8 GHz, Hexa Core, Kryo 470); Chipset: Qualcomm Snapdragon 730; Architecture: 64 bit; GPU: Adreno 618; RAM: 8 GB; Screen Size: 6.4 inches (16.26 cm); Screen Resolution: 1080 x 2400 pixels; Aspect Ratio: 19.5:9; Display Type: Super AMOLED; Display dots per inch: 411 ppi; Touch Screen: Yes, Capacitive Touchscreen, Multi-touch; Bezel-less display: Yes with punch-hole display; Internal Memory: 128 GB; Expandable Memory: Yes, Up to 1 TB; SIM 1: 4G Bands: TD-LTE 2300(band 40)FD-LTE 1800(band 3) 3G Bands: UMTS 1900 / 2100 / 850 / 900 MHz 2G Bands: GSM 1800 / 1900 / 850 / 900 MHzGPRS: Available EDGE: Available; SIM 2: ...
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