I think there is no re-flash required. Just try to de-install smscon editor (because it depends on smscon) and then de-install smscon.

After de-installation you may even check if directory /opt/smscon exists and delete it.

Before doing all this, you might give a look at "Phone Settings" -> "Connection Settings" -> "Phone" -> scroll to the bottom to "SIM Card" and check if you selected "PIN code required". (the real english words my be different)