Flash firmware on Celkon A403
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How to flash Celkon A403?
Why reinstall the firmware?
Errors in the Android OS start to appear regularly.
Apps won't open.
Many applications from the Play Market do not start.
The phone restarts for no reason.
The phone slows down a lot during operation.
You want to update the firmware, as it does not suit you in terms of functionality.
Where can I find the firmware?
On the website of your phone manufacturer.
On specialized services on which various developers lay out 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.
Find information about your smartphone model.
Fully charge your device. If the battery runs out during the firmware, the device will no longer turn on.
Download Firmware and Place it on the SD card.
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.
On the next screen, you need to select the 'TWRP FLASH' item and give the application root-rights.
On the main screen of the application, click '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.
When the file is loaded, you need to 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.
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.
Transfer the firmware and other necessary files to the SD card.
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 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. Click the 'Install' button.
On the file selection screen, at the very top there is a 'Storage' button for selecting an SD card.
Select the storage to which the files were copied. Press the OK button.
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.
When the procedure for installing the firmware is completed, the message 'Successful' appears on the screen.
Summary: Chipset: Spreadtrum SC7715; CPU: 1GHz ARM Cortex-A7; GPU: Mali-400MP; RAM: 512MB; Internal Memory: 4GB; External Memory: microSD; Camera Resolution: 3.15 Megapixel; Camera Flash: LED; Front Camera: 1.3 Megapixel; Other Functionalities: Accelerometer; Speaker: Mono; Battery Capacity: 1400mAh; Battery Type: ; Display Resolution: 480x800px; Display Size: 53x88mm (2.09x3.46") ~233PPI; Display Diagonal: 4.0"; Display Type: 16M TFT; Secondary Display Resolution: ; Input: Capacitive Touchscreen; Talk Time: ; Standby Time: ; Smart Phone OS: Android OS, v4.4.2; Java: ; Vibration: Yes; Ringtone: ; WiFi: Wi-Fi 802.11 b/g/n; USB: v2.0; Bluetooth: v4.0; Positioning System: Int ...
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