Errors constantly appear in the Android operating system.
Some installed applications stop opening.
Many programs from the Play Market do not start.
The phone restarts or shuts down for no reason.
The phone started to work slowly.
You are not satisfied with the functionality of the stock (official) firmware.
Where can I find the firmware?
On the phone manufacturer's website.
On specialized services on which developers lay out 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 SD card. An SD card is needed to write firmware to it.
Determine your smartphone model.
Fully charge your phone. If the battery runs out during boot, the device will no longer turn on.
Download the archive with Firmware and place it on the SD card.
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 agree to install the firmware, as well as agree to grant the application Superuser rights and click 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 on the 'Select Device' drop-down list, and select 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.
When the file is loaded, 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.
Press the 'FLASH TO RECOVERY' button and confirm that you are ready to start the procedure - press 'OK' in the question window.
When the message 'Flash Completed Succsessfuly!' appears. Click 'OK'. The TWRP installation procedure is now complete.
Write the firmware and other necessary files to the SD card. Using a PC or laptop card reader, it will be much faster.
Insert a memory card into the device.
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 delete all user data from the phone, this will avoid many problems. press 'WIPE' on the home 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 you copied the files. Press the 'OK' button.
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 flashing the phone will begin, 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: OS version: Android 4.2; CPU: MediaTek MT6572, 1200 MHz; Processor cores number: 2; RAM: 512 Mb; Built-in memory: 4 GB; Video processor: Mali-400 MP; Memory card slot: yes, volume of up to 32 GB; Multi SIM mode: alternate; SIM-card amount: 2; Case type: classic; Height: 133 mm; Width: 62 mm; Thickness: 11 mm; Weight: 120 grams; QWERTY-keyboard: yes; Diagonal: 3.5"; Screen type: colored TFT, 16.78 mln colors, sensor; Sensor screen type: multitouch, capacitive; Screen size: 480x320; Number of pixels per inch (PPI): 165; Automatic display rotation: yes; Sensors: approaching sensor; Rear camera: 5 MP; Front camera: 2 megapixels; Video Recording: yes; Standard: GSM 900/1800/1900, 3G; Interfaces: ...
Comments, questions and answers on the flash firmware BQ BQS-3552 Berkeley