After reset completes, highlight and press Power
The reset process can take several minutes. If your battery dies midway through the formatting process, it can corrupt the system partition, leaving you with a "bricked" phone that won't turn on.
Alternative: Some versions require holding while connecting the device to a computer via USB.
Once in recovery mode, your touchscreen will not work. Use the Volume Up/Down keys to scroll and the Power button to select.
The HTC U24 Pro will now reboot. The first boot after a hard reset takes significantly longer (up to 10 minutes). Be patient and do not press any buttons.