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The "2" doesn't work at times on the unlock screen. I know the easy fix is to pick a pass code that contains no "2"s, but I'd rather figure out why it won't work from time to time. If I do a soft reboot it fixes the issue... for a while.
 
Has happened to me. Respring and it'll work again. It's annoying, I know. Restore if it bugs you that much.
 
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