very difficult to open. Best chance is with a ubomb and even that is slim. You have almost no chance if you have an orange nexus and slim to none if its a blue t911.
Be aware that you are almost as likely to kill the card as open it with these scripts so if the card is in any way important to you then dont even think about trying to open it at the moment !
2 open, 2 killed and 2 you will probably kill before opening !
Thats the kind of odds you are up against although you can improve matters considerably by tweaking the unlooper. Unfortunately, to get things working properly you often have to be willing to sacrifice a few cards !