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Flash firmware on ZTE V791

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How to flash ZTE V791?


Why reinstall the firmware?

Errors in the operation of the Android OS begin to appear.

Some installed applications do not open.

Many applications from the Play Market do not start.

The phone restarts or shuts down by itself.

The phone began to slow down a lot.

You want to update your firmware.





Where can I find the firmware?

On the official website of your phone manufacturer.

On specialized services on which various developers lay out custom or official OS.


What should be done before installing the firmware?

Create a backup copy of all personal information: contacts, photos and transfer it to another computer.

Insert an SD card into your phone to write the firmware to it.

Remember your smartphone model.

Fully charge your device. If the battery runs out during the firmware, the device will no longer turn on.

Download Firmware and Place it on the SD card.





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 need to give consent to future manipulations, as well as to give consent to granting the application Superuser rights and click the 'OK' button.

After moving to the next screen, you need to select the 'TWRP FLASH' item and give the application root rights.

TWRP

On the main screen of the application, select 'Select Device', and find your phone model.

After selecting a device, the application will direct the user to a web page to download the appropriate modified recovery environment image file. 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.

Now press the 'FLASH TO RECOVERY' button and confirm your choice, press 'OK'.

When the message 'Flash Completed Succsessfuly!' appears. Click 'OK'. The TWRP installation procedure can be considered complete.

Transfer the firmware and other necessary files to the SD card.

Insert a SD 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

TWRP

Before flashing, you need to clear the 'Cache' and 'Data' sections, press 'WIPE' on the main screen. You will delete all user data from the phone, this will avoid software errors and other problems.

Now you can start flashing. Press the 'Install' button.


TWRP

On the file selection screen, at the very top there is a 'Storage' button for selecting an SD card.

Select the storage to which the files were copied. Press the OK button.



TWRP

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 damaged files during recording.

The procedure for writing files to the phone's memory will begin, this is 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: GSM frequencies: 850 900 1800 1900; Standard UMTS: 850 900 1900 2100; Standard LTE: no; Type: Touch; Dimensions (W x H x D): 116.50 x 61.20 x 13.00 mm; Main display: Color / TFT256k colors320 x 480 px (3.50") 165 ppi; Display protection: no; Standard battery: Li-Ion 1200 mAh; Quick battery charging: no; Internal memory: 512 MB; RAM memory: 256 MB; Memory cards: yes, microSD, microSDHC (up to 32 GB); Operating system: Android 2.3 Gingerbread; Processor: MediaTek MT6575M; Processor clock: 1.00 GHz; Number of cores: 1; GPU: PowerVR SGX531 @522 MHz; Touchscreen: yes; DualSIM: no; Announced: -; Camera location: Back; Photo matrix: 2 Mpx; Video resolution ...

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