Flash firmware on Polaroid Cosmo Z2
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How to flash Polaroid Cosmo Z2?
Why reinstall the firmware?
Errors in the operation of the Android OS begin to appear.
Some installed applications stop opening.
Many programs from the Play Market do not work.
The phone restarts or shuts down randomly.
The phone is slow.
You want to update your firmware.
Where can I find the firmware?
On the official website of the phone manufacturer.
On sites where developers 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 your SD card into your phone. It must have enough memory to fit the firmware.
Remember 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. Place it on the SD card.
Installing TWRP Recovery
Install the Official TWRP App from the Play Store on your phone.
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.
On the next screen, select 'TWRP FLASH' and give the application root rights.
On the main screen of the application, select '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. Select the file downloaded in the previous step.
Press the 'FLASH TO RECOVERY' button and confirm your choice.
After the burn process is complete, the message 'Flash Completed Succsessfuly!' appears. Click 'OK'. The TWRP installation procedure can be considered complete..
Write the firmware to the SD card. Using a PC or laptop card reader.
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, 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.
Now you can start flashing. Press the 'Install' button.
The file selection screen appears. At the very top is the 'Storage' button, select the location where the firmware file is located.
Select the location where 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, 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 device's memory will begin, accompanied by the appearance of inscriptions in the log field and the completion of the progress bar.
The completion of the firmware installation procedure is indicated by the inscription 'Successful'.
Summary: OS: Android 7.0 Nougat; CPU: Cortex-A53; CPU frequency: 1250.0 MHz (4-core); Chipset: Mediatek MT6737; GPU: Mali-T720 MP2; GPU frequency: 650.0 MHz (2-core); RAM Memory: 2 GB; Display: LCD IPS Color (16M), 720x1280 px (5.2") 282ppi; Touch screen: yes; Built-in memory: 16 GB; Memory card: MicroSDHC max. 64 GB; Camera: 12.78 MPx; Resolution: 4128 x 3096 px; Flash: LED; Autofocus: yes; Optical zoom: no; Digital zoom: yes; Second camera: 7.99 Mpx; Resolution: 3264 x 2448 px; Bluetooth: 4.0; EDGE: yes; GPRS: yes; GPS: yes; A-GPS: yes; LTE: LTE-FDD: 700, 850, 1700/2100, 1900, 2600; GSM: 850 900 1800 1900; HSDPA: 850 900 1900; USB: 2.0; WAP: yes; Wi-Fi: 802.11 b/g/n; Audio formats: MP3, eAAC , WAV ...
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