Open the telephone dialler by pressing the software button on the bottom left of the front screen
You’ll be asked if you want to restore all of the original settings and warned that the phone will restart. Choose yes.
Now you’ll be asked to enter the lock code. Enter 00000000 as the code. That’s eight zeros.
Click the OK button and the phone will reset. This takes some time so be patient.
Be aware that the phone memory, the hard drive and any inserted memory cards will all be wiped clean so back up anything you need to keep either to a PC or to a memory card (don’t forget to remove the memory card before the reset).