If you want to hard reset your Nokia Lumia or Microsoft Lumia phones because of reasons like security code or software malfunction, do the following below.
Note.
You will lose all files after this process. Backup your files.
Lumia 520/635/710/810/925 etc
Turn of the device
Press Power button
When phone vibrates leave power button and press volume down button till you see exclamation sign !
Now press the following button combination
Volume up - Volume down - Power - Volume Down
Phone will reboot and you will see gear wheel spinning .
Wait for process to complete. (Can take about 8-30mins)
Phone will reboot after process is complete..
Lumia 800 / 900Turn off the devicePress and hold volume down - Camera - Power button for about 10 secsWhen phone vibrates release power button but still hold on to volume down and camera buttonPhone will start reset processWait for it to complete.. Can take about 8 - 30mins
ADS HERE !!!