These are the guidelines to install TWRP Recovery on HTC Desire 620 smartphones.

REQUIREMENTS

• Use this guide on the HTC Desire 620 only. The HTC Desire series comes with numerous devices all with unique numbers. If necessary, you can find your model number by tapping on the Menu > Settings > About Device > Model Number. Use a Google search with that model number information to help problem solve your Desire smartphone.

BEFORE WE BEGIN

• Download the TWRP Recovery image for the Desire 620 smartphone from this link.
• Download the universal ADB Driver from this link and install it on your Windows PC before you start with the steps.
• Set up ADB on your computer so you can start typing ADB commands using the command prompt from your Windows computer.

HOW TO INSTALL TWRP RECOVERY ON HTC DESIRE 620

1. Enable the USB Debugging Mode on your HTC Desire 620 by tapping on the Menu > Settings > Developer Options > USB Debugging Mode.
2. Desire 620 owners who cannot see the Developer Options from the Settings menu probbaly need to unlock it by tapping on the Menu > Settings > About Device > Build number 7 times. That build number is a trick Google gives so the Developer Options aren’t always on for everybody to use.
3. Connect the HTC Desire 620 smartphone to the computer with the USB cable.
4. Copy the TWRP file over to the same folder as your ADB so they are both available from the same directory.
5. With the folder open, hold the Shift key and right-click the mouse in the folder where it shows the white background.
6. Choose to open a new command window here from the menu you should see after performing the previous step.
7. Type the first command: adb reboot bootloader
8. Your HTC Desire 620 smartphone I will now boot in the bootloader mode where it is ready to start receiving ADB commands from the command line. Now we will flash the custom recovery on the device.
9. Type the next command: fastboot flash recovery twrp.img
10. The custom recovery is now flashed on the HTC Desire 620 smartphone. Now it’s time to reboot.
11. Type the last command: fastboot reboot

You will sometimes find that rebooting the device will restore the stock recovery and wipe the custom recovery you just installed. To fix that problem, you must boot directly to the recovery mode after entering the “fastboot reboot” command.