 The default SpringBoard can be changed with tweaks like FrontPage.A bug was discovered in May 2015 where users pasted a certain set of characters and Unicode in a set order, causing the SpringBoard to crash and relaunch, which displays a black or white screen and white or black Apple logo (depending on the user's device) that looks identical to the boot screen.The phenomenon was later narrowed down to it only happening when the message was shown via the notification drop-down or the lock screen; it can be fixed by disabling this.