Flash firmware on Vivo X21i
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How to flash Vivo X21i?
Why reinstall the firmware?
Errors periodically appear in the Android operating system.
Some installed applications stop opening.
Many programs from the Play Market do not work.
The phone restarts or shuts down randomly.
The phone slows down a lot during operation.
You have decided to try a different version of Android.
Where can I find the firmware?
On the phone manufacturer's website.
On sites where developers 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 your SD card into your phone. It must have enough memory to fit the firmware.
Find out the exact model of your smartphone.
Fully charge your phone. If the battery runs out during boot, the device will no longer turn on.
Download archive with Firmware. Place it on the SD card.
Installing TWRP Recovery
Download and install the Official TWRP App from the Play Market.
At the first start, you need to give consent to future manipulations, as well as consent to granting the Superuser rights to the application. Check the checkboxes and press 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 on the 'Select Device' drop-down list, 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. Select the file downloaded in the previous step.
Press the 'FLASH TO RECOVERY' button and confirm your choice, press 'OK'.
The recording process is very fast, and upon completion, the message 'Flash Completed Succsessfuly!' appears. Click 'OK'. The TWRP installation procedure can be considered complete.
Write the firmware to the SD 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. Open the menu and select the 'Reboot' item, and then click on the 'REBOOT RECOVERY' button.
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.
Press the 'Install' button to start the flashing.
The file selection screen appears. At the very top there is a 'Storage' button for selecting an SD card.
Select the location where the files were copied. Press the 'OK' button.
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 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.
After completing the installation procedure, a 'Successful' message appears on the screen.
Summary: Smart Phone OS: Android 8.1 (Oreo); Chipset: Mediatek MT6771 Helio P60; CPU: Octa-core (4x2.0 GHz Cortex-A73 & 4x2.0 GHz Cortex-A53); GPU: Mali-G72 MP3; Type: Super AMOLED capacitive touchscreen, 16M colors; Screen Size: 6.28 inches, 98.4 cm2 (~85.0% screen-to-body ratio); Resolution: 1080 x 2280 pixels, 19: 9 ratio (~402 ppi density); Multitouch: Yes; : - Funtouch OS 4.0; Main Camera: Dual: 12 MP (f/1.8, 1/2.5", 1.4 ...
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