Flash firmware on Bravis NB851
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How to flash Bravis NB851?
Why reinstall the firmware?
Errors start to appear in the operating system.
Some installed applications do not open.
Many programs from the Play Market do not start.
The phone shuts down and restarts for no apparent reason.
The phone began to slow down a lot.
The OS does not match the system requirements of the smartphone.
Where can I find the firmware?
On the official website of your phone manufacturer.
On specialized services 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 another medium.
Insert your SD card into your phone. An SD card is needed to write firmware to it.
Find information about your smartphone model.
Fully charge your device. If the battery runs out during the firmware, the device will no longer turn on.
Find and download the archive with Firmware.
Installing TWRP Recovery
Download the Official TWRP App to your phone from the Play Market. And install this app.
When you start the application for the first time, you need to give consent to future manipulations, as well as to give consent to granting the application Superuser rights and click the 'OK' button.
After moving to the next screen, you need to select the 'TWRP FLASH' item 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 application will direct the user to a web page to download the appropriate modified recovery environment image file. Download the suggested *.img file.
When the file is loaded, you need to 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.
After adding the image file to the program, click the 'FLASH TO RECOVERY' button and confirm your choice, click 'OK'.
When the message 'Flash Completed Succsessfuly!' appears. Click 'OK'. The TWRP installation procedure can be considered complete.
Copy the required files to the memory card. Using a PC or laptop card reader.
Insert a memory card into the 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 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.
Now 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 storage to which the files were copied.
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, this is accompanied by the appearance of inscriptions in the log field and the movement of the progress bar.
The completion of the firmware installation procedure is indicated by the inscription 'Successful'.
Summary: Colors: Black; Dimensions: 206.5 x 122.8 x 7.7 mm; Weight: 332 g, 0.73 lbs, 11.71 oz; Body materials: Plastic; Type: IPS; Display Colors: 24 bit, 16777216 colors; Size: 8 in, 203.2 mm, 20.32 cm; Screen-to-body ratio: 73.42%; Resolution: 1280 x 800 pixels; Pixel Density: 189 ppi, 74 ppcm; Display features: Multi-touch, Capacitive; Primary: 1600 x 1200 pixels, 1.92 MP; Flash: LED; Video Recording: 1280 x 720 pixels, 0.92 MP at 30 fps; Secondary: 640 x 480 pixels, 0.31 MP; Camera Features: Continuous shooting, Geotagging, Digital zoom, HDR, Panorama, Face detection, ISO settings, White balance settings, Self-timer; Video Playback: 3GPP, AVI, MP4, Xvid; Audio Playback: AAC, AMR ...
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