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Firmware HTC Desire 21s

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HTC Desire 21s

OS: Android v11

CPU: Qualcomm SM7125 Snapdragon 720G (8 nm)
Display: 6.6 inches
Battery: 5200 mAh

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 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 you are interested in and place it on the phone's SD card.
- Next, turn off your phone.
- Press the desired combination of buttons on the phone body. The set of buttons may differ depending on the phone. A universal option is to try pressing the following keys.
- Press the Power + Volume up (or Volume Down) (+Home) buttons together for a few seconds.
- Recovery mode will appear on the screen.
- Use the volume buttons to navigate through the menus and press the Power button to make a selection.
- Then select 'Wipe data / factory reset' from the menu.
- Select 'Yes - delete all user data' and confirm your choice with the Power button.
- From the Recovery mode menu select 'Wipe cashe partition'.
- Select 'Yes - Wipe cache' and confirm with the Power button.
- Select 'advanced' from the menu.
- Select 'Wipe Dalvik Cache' and confirm with the Power button.
- From the menu select 'Yes - Wipe Dalvik Cache'.
Go back, press 'Go Back'.
- Select 'mounts and storage' from the menu.
- Then select 'format / system' from the menu.
- From the menu select 'Yes - Format' .
Go back, press 'Go Back'.
- Select 'install zip from sdcard' .
- Then select 'choose zip from sdcard' from the menu.
- From the menu select 'Yes - Install your firmware name' .
- Then select 'Reboot system now' from the Recovery mode 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 device's memory.
- Go to TWRP recovery. This is done in the same way as with CWM.
- Perform a factory reset. When the operation is completed return to the original menu by pressing the 'Back' key.
- In the main menu, select 'Install' and select the firmware file. Click on it by dragging the slider to the side.
- The phone flashing process will end in 2-3 minutes.
- When the firmware operation is completed, 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 .zip archive with the image, and place it in the folder with 'ADB'
- Put your smartphone in fastboot mode and write the prompt in the command line: fastbooflash zip, where is the name of your firmware.
- Wait until the end of the installation and reboot the device.

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