Errors in the operation of the Android OS begin to appear.
Some applications do not open, reinstalling which does not lead to a positive result.
Many applications from the Play Market do not start.
The phone restarts or shuts down for no reason.
The phone began to slow down a lot.
You want to update your firmware.
Where can I find the firmware?
On the website of your phone manufacturer.
On specialized services on which various 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 an SD card into your phone to write the firmware to it.
Remember your smartphone model.
Fully charge your device.
Download 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 need to give consent to future manipulations, as well as to give consent to granting 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, select 'Select Device', and find your phone model.
After selecting a phone, the application will direct the user to a web page to download the modified recovery environment image file. Download the proposed *.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.
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 can be considered complete.
Transfer the firmware and other necessary files to the SD card.
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. 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. You will delete all user data from the phone, this will avoid software errors and other problems.
Now you can start flashing. Press the 'Install' button.
The file selection screen is displayed. At the very top is the 'Storage' button, which allows you to switch between types of memory.
Select the storage to which 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 writing files to the phone's memory 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: GSM frequencies: 850 900 1800 1900; Standard UMTS: no; Standard LTE: no; Standard TD-SCDMA: 1900 2000; Type: Touch; Dimensions (W x H x D): 123.00 x 63.00 x 9.90 mm; Weight: 128.50 g; Main display: Color / TFT16M colors480 x 800 px (4.00") 233 ppi; Display protection: -; Talk time (max.): 2G: 420 min. (7.0 h)3G: 360 min. (6.0 h); Stand-by (max.): 2G: 180 h (7.5 days)3G: 180 h (7.5 days); Standard battery: Li-Ion 1710 mAh; Internal memory: 4 GB; RAM memory: 1 GB; Memory cards: yes, microSD, microSDHC (up to 32 GB); Operating system: Android 4.2.1 Jelly Bean; Processor: -; Processor clock: 1.20 GHz; Touchscreen: yes; DualSIM: yes; DualSIM mode: -; Hy ...
Comments, questions and answers on the flash firmware Oppo R823T