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Flash firmware on ZTE Grand X Z777

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How to flash ZTE Grand X Z777?


Why reinstall the firmware?

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

Some installed applications do not open.

Many programs from the Play Market do not start.

The phone restarts or shuts down randomly.

The phone slows down a lot during operation.

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 developers lay out 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.

Remember your smartphone model.

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

Download the archive with Firmware and place it on the SD card.





Installing TWRP Recovery

Install the Official TWRP App from the Play Store on your phone.

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.

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, 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.

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 and other necessary files to the SD card. Using a PC or laptop card reader, it will be much faster.

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

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. 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 location where you copied the files. 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 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.

The completion of the firmware installation procedure is indicated by the inscription 'Successful'.





Summary: GSM frequencies: 850 900 1800 1900; Standard UMTS: 850 1900 2100; Standard LTE: no; Type: Touch; Dimensions (W x H x D): 144.78 x 72.90 x 9.40 mm; Weight: 171.80 g; Main display: Color / TFT540 x 960 px (5.00") 220 ppi; Display protection: Corning Gorilla Glass; Talk time (max.): 2G: 510 min. (8.5 h); Stand-by (max.): 2G: 420 h (17.5 days); Standard battery: Li-Ion 2300 mAh; Quick battery charging: no; Internal memory: 4 GB; RAM memory: 1 GB; Memory cards: yes, microSD, microSDHC (up to 32 GB); Operating system: Android 4.3 Jelly Bean; Processor: Qualcomm Snapdragon 200 8210; Processor clock: 1.20 GHz; Number of cores: 2; GPU: Adreno 302; Touchscreen: ...

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