Flash firmware on Polaroid A400
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How to flash Polaroid A400?
Why reinstall the firmware?
The operating system keeps getting errors.
Some installed applications stop opening.
Many applications from the Play Market do not start.
The phone restarts or shuts down for no reason.
The phone is slow.
You want to update the firmware, as it does not suit you in terms of functionality.
Where can I find the firmware?
On the phone manufacturer's website.
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 and transfer it to another medium.
Insert your SD card into your phone. It must have enough memory to fit the firmware.
Determine your smartphone model.
Fully charge your phone. If the battery runs out during boot, the device will no longer turn on.
Download archive with Firmware.
Installing TWRP Recovery
Download the Official TWRP App from the Play Market. Download, install and launch the application..
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.
Going to 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 find your phone model.
After selecting a device, the program redirects the user to a web page to download the corresponding image file of the modified recovery environment. Download the suggested *.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 that you are ready to start the procedure - press 'OK' in the question window.
After the burn process is complete, 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 device.
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, 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.
You can start flashing. Click 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 you copied the files.
Find the file we need 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 device's memory will begin, accompanied by the appearance of inscriptions in the log field and the completion of the progress bar.
When the procedure for installing the firmware is completed, the message 'Successful' appears on the screen.
Summary: OS: Android 6.0 Marshmallow; CPU Speed: 1.3 GHz; Primary display: TN LCD 4" 800 x 480 pixels WVGA, 233 ppi; Secondary display: No; RAM: 512 MB; Internal memory: 8 GB; Memory Card: MicroSD, Up to 64 GB; Primary camera: 5 MP 2592 x 1944 pixels LED flash; Secondary camera: 2 MP 1600 x 1200 pixels; Headphone: Yes 3.5mm; WI-FI: Yes 802.11 b/g/n 0; NFC: No; GPS: No; Bluetooth: No; HDMI: No; Hotknot: No; USB: Yes Micro-USB 2.0; Infrared: No; Capacity: Li-Ion; Stand by: Up to 200 h; Talk time: Up to 4 h 30 m; Dimension: 119.89 x 65.02 x 9.91 mm; Weight: 90 g; SIM: Mini-SIM, Single-SIM; Colors: black, white; ...
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