I am looking for some private API or piece of code which will allow me to reboot iOS device or restart Springboard.

I looked at SBReboot, but it looks like it's protected by some entitlement.

Also, I tried reboot(int) and reboot2(int), but it looks like both of them work only for "root" user and will do nothing for a "mobile" user.

I am looking for a solution which works on non jailbroken device. However, private API's are ok (an application won't go to AppStore)

Update 1

In response to Josiah answer below. Finding an expoit for gaining root privileges isn't the only option. As example, any vulnerability which will allow to crash kernel or Springboard is fine with me (even if it can't be used to get a root privileges).

ios iphone-privateapi
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