Flash firmware on Four S750 Sapphire
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How to flash Four S750 Sapphire?
Why reinstall the firmware?
Errors in the operation of the Android OS begin to appear.
Some installed applications do not open.
Some 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 Internet resource 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 the gadget. It must have enough memory for the firmware.
Remember your smartphone model.
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.
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, select the 'TWRP FLASH' item and provide the application with root rights.
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.
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.
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 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. 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
Before flashing, it is recommended to clear the 'Cache' and 'Data' sections. This will delete all user data from the device, but avoid a wide range of software errors and other problems. You must press 'WIPE' on the main screen.
Now you can start flashing. Press the 'Install' button.
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.
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, accompanied by logging and filling in the progress bar.
The completion of the firmware installation procedure is indicated by the inscription 'Successful'.
Summary: OS: Android 7.1 Nougat; CPU: MT6757T; CPU frequency: 2400.0 MHz; Chipset: MediaTek; GPU: ARM Mali-T880MP2; GPU frequency: 900.0 MHz; Display: LCD IPS Color (16M), 1080x2280 px (6.0") 420ppi; Touch screen: yes; Protection: Sapphire glass; Built-in memory: no; Memory card: MicroSD/TransFlash; Camera: 13.0 MPx; Flash: Dual LED; Autofocus: yes; Diaphragm: f/2.0; Diaphragm: f/2.0; Optical zoom: no; Digital zoom: yes; Second camera: 13.0 Mpx; Bluetooth: 4.2; EDGE: yes; GPRS: yes; GPS: no; A-GPS: no; LTE: LTE-FDD: 800, 2100, 2600; GSM: 850 900 1800 1900; HSDPA: HSPA; HSDPA speed: 21 Mb/s; USB: 2.0; WAP: no; Wi-Fi: 802.11 a/b/g/n; Audio out: Jack 3,5 mm; Games: yes; MP3 player: yes; MP3 ringtones: ...
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