Flash firmware on Gretel A7
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How to flash Gretel A7?
Why reinstall the firmware?
Errors periodically appear in the Android operating system.
Some applications do not open, reinstalling which does not lead to a positive result.
Some applications from the Play Market do not start.
The phone restarts or shuts down randomly.
The phone is slow.
You have decided to try a different version of Android.
Where can I find the firmware?
On the official website of the phone manufacturer.
On sites 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 an SD card into your phone to write the firmware to it.
Find out the exact model of your smartphone.
Fully charge your phone battery.
Find and 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.
When you start the application for the first time, you must consent to future manipulations, as well as consent to granting the application Superuser rights. Check the checkboxes and press the 'OK' button.
On the next screen, select 'TWRP FLASH' and give the application 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 phone, the application will direct the user to a web page to download the modified recovery environment image file. Download the proposed *.img file.
After downloading the image file, go 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.
After the burn process is complete, the message 'Flash Completed Succsessfuly!' appears. Click 'OK'. The TWRP installation procedure can be considered complete..
Copy the firmware and other necessary files to the SD card.
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. You will delete all user data from the phone, this will avoid software errors and other problems.
Press the 'Install' button to start the flashing.
The file selection screen is displayed. At the very top is the 'Storage' button, select the location where the firmware file is located.
Select the location where the files were copied.
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, this is accompanied by the appearance of inscriptions in the log field and the movement of the progress bar.
After completing the installation procedure, a 'Successful' message appears on the screen.
Summary: Brand: Gretel; Type: 3G Smartphone; Smart Phone OS: Android 6.0; Service Provider: Unlocked; SIM Card Slot: Dual SIM,Dual Standby; SIM Card Type: Micro SIM Card; CPU: MTK6580; Cores: 1.3GHz,Quad Core; RAM: 1GB RAM; ROM: 16GB; External Memory: TF card up to 32GB (not included); Screen type: Corning Gorilla Glass,IPS; Screen size: 4.7 inch; Screen resolution: 1280 x 720 (HD 720); Camera type: Dual cameras (one front one back); Back-camera: 8.0MP; Front camera: 2.0MP; Video recording: Yes; Picture format: BMP,GIF,JPEG,PNG; Music format: AAC,AMR,MP3,WAV; Video format: 3GP,MP4; I/O Interface: 2 x Micro SIM Card Slot,3.5mm Audio Out Port,Micophone,Speaker,TF/Micro SD Card Slot ...
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