If you signed your passport incorrectly or there is a mistake in your signature, you may leave it if it is not too bad. If you think you need to change it, simply strike a single line through the mistake and sign the correct signature. If this is not good enough, you may need to apply for a replacement passport.
Only works on rooted devices (or devices with Recovery Mode) Disable ADB on screen off and enable ADB *after* screenlock is unlocked. Source code (+artwork) freely ($0) available on demand by email. Adb-Lock helps protecting Android (prior to 4.4.3) against the adbd authorisation bypass attack by (found by Henry Hoggard, MWR Labs).
In these situations, all you need to do is display a black (or white) screen. Doing so gives the impression that you've pulled up a blank slide for the occasion. You can blank the screen during a slide show with one simple keystroke. To display a black screen, press the B key. If you would rather display a white screen, simply press the W key.