If you misstype the serial number in a bind zone file you might be in a lot of trouble . Especially if you misstype it like this:
2014300101 instead of 2014030101 . Yet there is a way to fix it:
According to the docs :
Add to the current serial number 2147483647 and rndc reload, then put the correct serial and rndc reload again.
does not work, now the new serial is much higher