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Flash firmware on Greentel G9 3g

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How to flash Greentel G9 3g?


Why reinstall the firmware?

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

Some applications will not open.

Many applications 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 the manufacturer.

On Internet resources where users 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.

Remember your smartphone model.

Charge your phone fully. If the battery runs out during boot, the device will no longer turn on. It will be difficult to restore it.

Download archive with Firmware.





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.

In the next screen, select the item 'TWRP FLASH' and provide the application with root-rights.

TWRP

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

After selecting the phone, the program will redirect the user to a web page to download the corresponding image file of the modified recovery environment. 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.

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.

Copy the necessary files to the SD memory 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. 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

The file selection screen is displayed. At the very top is the 'Storage' button, which allows you to switch between types of memory.

Select the location where you copied the files.



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: OS: Android 7.0 Nougat; CPU frequency: 1500.0 MHz (4-core); Chipset: MediaTek MT6580A; GPU: Mali-400 MP2; RAM Memory: 1 GB; Display: LCD IPS Color (16M), 480x854 px (4.5") 218ppi; Touch screen: yes; Built-in memory: 8 GB; Memory card: MicroSDHC max. 32 GB; Camera: 7.99 MPx; Resolution: 3264 x 2448 px; Flash: LED; Autofocus: yes; Optical zoom: no; Digital zoom: yes; Second camera: 1.92 Mpx; Resolution: 1600 x 1200 px; Bluetooth: yes; EDGE: yes; GPRS: yes; GPS: yes; A-GPS: yes; GSM: 850 900 1800 1900; HSDPA: 900 2100; USB: 2.0; WAP: yes; Wi-Fi: 802.11 b/g/n; Audio formats: MP3, WAV, AAC, AMR, MIDI, FLAC, WMA, AAC; Audio out: Jack 3,5 mm; MP3 player: yes; MP3 ringtones: yes; Polyphony: yes; Ra ...

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