Firmware alcatel TCL 20L

OS: Android 11, TCL UI

CPU: Octa-core (4x2.0 GHz Kryo 260 Gold & 4x1.8 GHz Kryo 260 Silver)

RAM: 128GB 4GB RAM, 128GB 6GB RAM

Display: 6.67" inc

Camera: 48 MP, f/2.0, 26mm (wide), 1/2.25'', 0.8µm, PDAF
-8 MP, f/2.2, 13mm (ultrawide), 1/4.0'', 1.12µm
-2 MP, f/2.4, (macro)
-2 MP, f/2.4, (depth)

Battery: 5000 mAh, Li-Po, non-removable

Before flashing, you need
Create a full backup of the firmware.
The battery must be 100% charged.

1. Flashing your phone using CWM Recovery
2. Flashing the phone using TWRP Recovery
3. Flashing the phone using Fastboot

1. Phone flashing using CWM Recovery
The rich functionality of CWM Recovery www.clockworkmod.com allows you to perform many manipulations with the device, including rolling the firmware. By default, stock Recovery is installed in the devices, which means that first you need to install the ClockWorkMod Recovery utility itself.
The general firmware process described below is for ZIP files. Instructions: - Download the firmware and place it on your phone's SD card.
- Turn off your phone in any convenient way.
- Depending on the phone manufacturer, press a specific combination of buttons on the phone body. A universal option is to try pressing the following keys.
- Press the Power + Volume up (or Volume Down) (+Home) keys together for a few seconds.
- Recovery mode will appear on the phone screen.
- Use the volume buttons to navigate through the menus and press the Power button to make a selection.
- Highlight 'Wipe data / factory reset' and press the Power button.
- Next in the menu, select 'Yes - delete all user data' .
- From the Recovery mode menu, select 'Wipe cashe partition'.
- Next in the menu, select 'Yes - Wipe cache' .
- Next select 'advanced' in the menu.
- Next in the menu, select 'Wipe Dalvik Cache' .
- Select 'Yes - Wipe Dalvik Cache' and confirm with the Power button.
Go back, press 'Go Back'.
- Next in the menu, select 'mounts and storage' .
- Highlight 'format / system' and press the Power button.
- Select 'Yes - Format' and confirm your choice with the Power button.
Go back, press 'Go Back'.
- Highlight 'install zip from sdcard' .
- Highlight 'choose zip from sdcard' .
- Select 'Yes - Install your firmware name' and confirm your choice with the Power button.
- Then select 'Reboot system now' from the menu.

2. Flashing the phone using TWRP Recovery
For those who prefer working with the utility in the form of TWRP Recovery, the following instructions for the step-by-step installation of the update in the form of a ZIP archive are offered:
- Upload the file with the firmware image to the SD card of your phone.
- Go to TWRP recovery. This is done in the same way as with CWM.
- Perform a factory reset. When cleaning the phone is finished, return to the original menu by pressing the 'Back' key.
- From the main menu select 'Install' and find and select the firmware file. Click on it by dragging the slider to the side.
- After that, the firmware process will start. This will take about 2-3 minutes.
- After completion, you must click on the 'Reboot System' item, and reboot the device.

3. Flashing the phone using Fastboot
A universal tool for flashing Android smartphones using a PC is the Fastboot utility. It is part of the SDK Platform Tools, which means it is suitable for a large number of devices.
Before starting the firmware, you need to get access to the system kernel. Very often, many manufacturers block this system parameter, not wanting users to change the system files of their firmware images with their own hands. To do this, you need to unblock Bootloader. To do this, you need to study the detailed instructions for configuring and managing the command line. Before starting the firmware using a computer, do not forget to enable USB debugging of the device in the engineering settings of the device.
- Copy the archive with the firmware image to the folder with 'ADB'
- Put your smartphone into fastboot mode and write the prompt in the command line: fastbooflash zip filename.zip.
- Wait for the end of the installation and reboot the device.

Thomas Nilan
Smartphone Expert

Thomas Nilan is a mobile phone expert with in-depth knowledge of the Android and iOS operating systems, who understands the settings of various hidden features that allow you to expand the capabilities of your smartphone, as well as get information about what is going on inside the phone for future repairs. He is an authority in his field, which has allowed him to become a ghostwriter for several technology publications, and he enjoys writing small mobile applications for testing smartphones.

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