Reset Nokia Lumia 435 To Remove Security Lock
https://gsmfixer.blogspot.com/2016/02/reset-nokia-lumia-435-to-remove.html
Nokia Lumia 435 Hard Reset to remove the security lock and solution of hang on logo problem can also be done. Second method is soft reset your NOKIA Lumia 435 from the phone settings to restore original mobile settings.
How To Remove Security Lock On Nokia Lumia 435 Phone
Hard Reset by Hardware Keys:Switch off your phone.
Press and hold the Volume Down key.
While holding Volume Down, press the Power key to turn the phone on.
Release the Power rocker when the phone vibrates but continue to hold Volume Down
When the exclamation mark appears on the display, release Volume Down.
Afterwards press this sequence of keys: Volume Up -> Volume Down -> Power button -> Volume Down
Device should now restart.
Yuppie! You have done!