Developer Chris Walsh has pulled his ChevronWP7.updater tool for Windows Phone 7 handsets from the web.
There's no word from either Walsh or Microsoft as to why the tool has disappeared. The only clue, uncovered by ComputerWorld, is a German-language Facebook post by Frank Prengel, a Microsoft technical evangelist for Windows Phone 7, warning users of the risks of using "unofficial hacker tools" which can leave handsets in an "undefined state" and make "the installation of future updates impossible."
Personally, I wouldn't read too much into that Microsoft statement as it's pretty much the default statement for everything unsupported by the Redmond giant.
We'll have to wait and see if this tool makes a reappearance.
[UPDATE: Microsoft makes its displeasure of homebrew updates official:
We're working hard to get this job done as quickly as possible. But I've noticed that some of you are turning to homebrew solutions to update your phone immediately. As an engineer and a gadget lover, I totally understand the impulse to tinker. You want the latest technology and you're tired of waiting. Believe me, I get it.
But my strong advice is: wait. If you attempt one of these workarounds, we can't say for sure what might happen to your phone because we haven't fully tested these homebrew techniques. You might not be getting the important device-specific software we would typically deliver in the official update. Or your phone might get misconfigured and not receive future updates.
It's even possible your phone might stop working properly. Bottom line: unsupported workarounds put you in uncharted territory that may void your phone warranty. We've made a lot of progress in recent weeks, so I urge you to please be patient for just a bit longer and wait for your official update notification to arrive.
If you're going to tinker, remember the phrase 'own risk'!}