An April Fool’s Day gag drew the ire of a number of would-be iOS jailbreakers yesterday. A post on iJailbreak.com proclaimed that a new untethered iOS 5.1 jailbreak for A5 and A5X iOS devices (iPhone 4S, iPad 2, new iPad) was available. The article offered users a supposed link to download the AprilRa1n jailbreak tool and jailbreak their devices.

Of course, there were plenty of hints that this was a gag. If the name AprilRa1n wasn’t enough of a giveaway, the phrase “april-fools-joke” in the article’s URL should’ve been a clue. Failing that, there’s the disclaimer at the bottom of the article:

Finally, if that wasn’t enough, there’s the download link. Instead of initiating a download of the AprilRa1n tool, the download link goes to the following video:

Some people, however, weren’t quite sharp enough to pick up on the hints, and went ahead and updated their devices to iOS 5.1 anyway. In times past, this wouldn’t be too much of a problem: just roll back to the previous version of iOS, re-jailbreak, and you’re done. It’s a pain in the neck, but not a huge problem. Unfortunately, though, Apple took steps this time around to ensure that the upgrade to iOS 5.1 is a one-way trip. Once you’ve updated, there’s no going back. Which means that those poor souls who updated their devices without reading to the end of the article (or checking the date, or the disclaimer, or the article URL, or clicking the download link) are stuck waiting for the real iOS 5.1 jailbreak. Unfortunately for them, as we reported last week, they may have several weeks to wait.

As you might expect, those who upgraded (and those who want to make fun of them) took to the post’s comments. Here are a few gems.

At least two people went ahead and upgraded to iOS 5.1:

Some got the joke but weren’t amused:

A few decided to play along:

While others point out that the clues were obvious:

What do you think? Was this a good joke or just too mean? Let us know in the comments.