Flash firmware on TCL U866
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How to flash TCL U866?
Why reinstall the firmware?
Errors constantly appear in the Android OS.
Apps won't open.
Some applications from the Play Market do not start.
The phone restarts for no reason.
The phone began to slow down a lot.
You are not satisfied with the possibilities of the stock firmware.
Where can I find the firmware?
On the website of your phone manufacturer.
On sites where users post custom or official OS.
What should be done before installing the firmware?
Back up your phone's user data.
Insert your SD card into your phone. 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.
Find and download the archive with Firmware. And place it on the SD card.
Installing TWRP Recovery
Download the Official TWRP App from the Play Market. And install it.
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, click 'Select Device', and select 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, go 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.
Click the 'FLASH TO RECOVERY' button and confirm your choice, click 'OK' in the question window.
When the message 'Flash Completed Succsessfuly!' appears. Click 'OK'. The TWRP installation procedure can be considered complete.
Copy the firmware and other necessary files to the SD card.
Insert a memory card into the phone.
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 'Reboot' 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.
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.
Select the firmware file 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.
After the firmware installation procedure is completed, the 'Successful' message appears on the screen.
Summary: Design: Classic; SIM cards standard: Mini Sim - Regular; GSM: 900 1800 1900; Other: TD-SCDMA; Dimensions (H/L/W): 116 x 63.8 x 13.8 mm, vol. 102 cm³; Display: TFTColor (260K) 240x480px; Touch screen: yes; Weight: 128 g; Battery: Li-Ion; Built-in memory: 256.0 MB; Memory card: MicroSD max. 32 GB; RAM memory: 512 MB; Operating system: Android 2.2; GPRS: yes; EDGE: yes; HSDPA: no; HSCSD: no; Wi-Fi: yes; Bluetooth: yes; USB: 2.0; IrDA: no; WAP: 2.0; XHTML: yes; SyncML: no; Data and fax mode: yes; Camera: 3.0 MPx; Resolution: 2048x1536px; Digital zoom: yes; Optical zoom: no; Flash: no; Autofocus: no; Video recording: yes; Video call: no; Radio: yes; RDS: ye ...
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