If you're a North American Porsche Design P'9981 BlackBerry owner, then BlackBerry OS 7.1 has just become official for you, 18.104.22.1681 to be exact. While we've already seen a higher version of .428 from SmarTone HK but of course there are plenty of those who prefer to install stock OS, so this one is for you.
As usual, carry out a backup for your data before updating even if it is an official OS. If you run into any troubles while updating be sure to check out our BlackBerry 101 guides to assist you, like How to Install or Upgrade to a new OS. Once you're updated you can join in on the forum discussions to talk about findings and/or fixes.