Flash firmware on HTC Desire 820 Dual Sim
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How to flash HTC Desire 820 Dual Sim?
Why reinstall the firmware?
Errors periodically appear in the Android operating system.
Some applications stop opening.
Many applications from the Play Market do not start.
The phone turns off for no apparent reason.
The phone started to work slowly.
You have decided to try a different version of Android.
Where can I find the firmware?
On the official Internet resource of the phone manufacturer.
On Internet resources where users post custom or official OS.
What should be done before installing the firmware?
Back up your contacts and user data and transfer it to your computer.
Insert your SD card into your phone. An SD card is needed to write firmware to it.
Find out the exact model of your smartphone.
Charge your phone fully.
Download archive with Firmware.
Installing TWRP Recovery
Install the Official TWRP App via the Play Market. And run this 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.
After moving to the next screen, select the 'TWRP FLASH' item 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 the phone, the application will redirect the user to a web page to download the modified recovery environment image file. 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. Then we tell the program the path where the file loaded in the previous step is located.
Now press the 'FLASH TO RECOVERY' button and confirm your choice, press 'OK'.
When the message 'Flash Completed Succsessfuly!' appears. Click 'OK'. The TWRP installation procedure is now 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 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 errors in the software, as well as other problems. Press 'WIPE' on the home screen.
Press the 'Install' button to start the flashing.
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 you copied the files.
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 damaged files during recording.
The procedure for flashing the phone will begin, this is 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: Sim Type: GSM+GSM; Dual Sim: Yes; Sim Size: Nano SIM; Dimensions: 157.69 x 78.7 x 7.7 mm; Weight: 155 g; Type: Color LCD screen, 16M colors; Touchscreen: Yes, with Multitouch; Size: 5.5 inches, 720 x 1280 pixels; PPI: ~ 267 PPI; Features: Corning Gorilla Glass 3 Screen Protection; RAM: 2 GB; Internal memory: 16 GB inbuilt; Card Slot: Yes, upto 128 GB; GPRS: Yes; EDGE: Yes; 3G: Yes; 4G: Yes; Wi-Fi: Yes, with wifi-hotspot; Bluetooth: Yes, v4.0; USB: Yes, microUSB v2.0; USB Features: USB on-the-go; GPS: Yes, with A-GPS Support; Sensors: Accelerometer, Compass; 3.5mm Headphone Jack: Yes; Extra: DLNA; Camera: Yes, 13 MP with autofocus; Dual Camera: No; Features: Face de ...
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