Formatting a HTC phone is not possible if you refer to the format action itself. Instead, you will need to perform a factory reset which will bring your phone to the state where it was released by the manufacturer. The factory reset can be performed in 2 ways: by using the settings you can find in your phone or by entering the recovery menu. I will provide both ways for your pleasure but keep in mind that performing a factory reset will erase your files, phone contacts, other media and so on.
Using the built-in settings
- Press HOME > MENU, and then tap Settings > Security > Factory data reset.
- Press accept and wait for the phone to restart and you'll have the state of the phone just like it was when you bought it.
Using the Recovery menu
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Turn off the phone and press these buttons HOME + END CALL/POWER + BACK
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Then the reset process will start. When it finishes, press Menu