[DNSB]

A bit more clearly (I think):

1. Hold the power button for 20-30 seconds which should force a power off and then release the power button.
2. Press and hold the light/home button.
3. Hold the power button until the LED lights up.
4. Continue to hold the light/home button until the LED starts rapidly flashing (disco-ing).
5. Release the light/home button and hopefully, you will now be seeing a factory reset in progress.