I discovered that using the SOS button to make a call,
then pressing add call, allowed me to enter the secret menu.
I was hoping that since I could now access the Livigent app that I could remove it (it was the old version) , however my phone would lag and then crash on the menu and app. (Plus I couldn't even uninstall the home app as it was locked as default.)
This may have just been since my sim card had no service, but without it the SOS button wouldn't 'call'.
Try it out though, maybe it will work for you.