Flash firmware on Karbonn A27 Retina
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How to flash Karbonn A27 Retina?
Why reinstall the firmware?
The operating system keeps getting errors.
Apps won't open.
Many programs from the Play Market do not work.
The phone restarts or shuts down for no reason.
The phone started to work slowly.
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 sites where developers 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 SD card. An SD card is needed to write firmware to it.
Determine your smartphone model.
Fully charge your device. If the battery runs out during the firmware, the device will no longer turn on.
Download archive with Firmware. 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.
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.
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 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 to the SD 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 delete all user data from the phone, this will avoid many problems. press 'WIPE' on the home screen.
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 location where the files were copied. 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.
When the procedure for installing the firmware is completed, the message 'Successful' appears on the screen.
Summary: Dimensions (mm): 133.60 x 66.00 x 9.10; Weight (g): 126.50; Battery capacity (mAh): 1800; Removable battery: Yes; SAR value: NA; Screen size (inches): 4.20; Touchscreen: Yes; Resolution: 540x960pixels; Pixels per inch (PPI): 256; Processor: 1.2GHz dual-core; RAM: 512MB; Internal storage: 4GB; Expandable storage: Yes; Expandable storage type: microSD; Expandable storage up to (GB): 32; Rear camera: 8-megapixel; Flash: Yes; Front camera: 2-megapixel; Operating System: Android 4.1; Wi-Fi: Yes; Wi-Fi standards supported: NA; GPS: No; Bluetooth: Yes; NFC: No; Infrared: No; Wi-Fi Direct: No; MHL Out: No; HDMI: No; Headphones: No; FM: No; Number of SIMs: 2; SIM 1: ; ...
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