Flash firmware on Oppo A9s
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How to flash Oppo A9s?
Why reinstall the firmware?
Errors constantly appear in the Android OS.
Some applications stop opening.
Many applications from the Play Market do not start.
The phone restarts for no reason.
The phone slows down a lot during operation.
You are not satisfied with the possibilities of the stock 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?
Back up your phone's user data.
Insert an SD card into the gadget. It must have enough memory for the firmware.
Determine your smartphone model.
Fully charge your device's battery.
Download archive with Firmware.
Installing TWRP Recovery
Download the Official TWRP App from the Play Market. And install it.
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.
On the main screen of the application, click 'Select Device', and select your phone model.
After selecting the phone, the application will redirect the user to a web page to download the modified recovery environment image file. 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.
Click the 'FLASH TO RECOVERY' button and confirm your choice, click 'OK' in the question window.
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 the phone.
To reboot into recovery, you need to enter the menu accessible by pressing the button with three stripes in the upper left corner of the main screen of the application. Select 'Reboot' and then click on the 'REBOOT RECOVERY' button.
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.
You can start flashing. Click the 'Install' button.
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 you copied the files.
Select the firmware file and click on it. A screen opens with a warning about possible negative consequences, as well as the item 'Zip signature verification'. This item should be checked by placing a cross in the check-box, which will avoid using damaged 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.
After the firmware installation procedure is completed, the 'Successful' message appears on the screen.
Summary: OS: Android 9.0 Pie; CPU: Kryo 260; CPU frequency: 2000.0 MHz (4-core); Chipset: Snapdragon 665; GPU: Adreno 610; RAM Memory: 4 GB; Display: LCD IPS Color, 720x1600 px (6.5") 270ppi; Touch screen: yes; Built-in memory: 128 GB; Memory card: microSDXC max. 256 GB; Camera: 12.0 MPx; Resolution: 4000x3000 px; Flash: LED; Autofocus: yes; Optical zoom: no; Digital zoom: yes; Second camera: 8.0 Mpx; Bluetooth: 5.0; EDGE: yes; GPRS: yes; GPS: yes; A-GPS: yes; Glonass: yes; LTE: LTE-FDD: 1800, LTE-TDD: 2300; GSM: 850 900 1800 1900; HSDPA: 850 900 1900 2100; USB: yes; WAP: 2.0; Wi-Fi: 802.11, b/g/n; Audio out: Jack 3,5 mm; MP3 player: yes; MP3 ringtones: yes; Polyphony: yes; Radio: yes; RDS: yes; RSS ...
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