Apparently you upgrade at your own risk
The Desire was the latest phone in the UK to get the new version of Android. Other devices had received the upgrade without incident. But Desire owners lit up O2's support forums with claims of software crashes and bricked phones immediately after performing the update.
Users are now forced to either wait for a patch or actually send in their phone if it is completely bricked. It may not be until the end of the month before O2 is able to fix the problem.
The process of upgrading to Android 2.2 has been a months-long ordeal as mobile carriers painstakingly work to get the software up and running on one phone at a time. Nearly a dozen handsets are compatible with the new operating system and each one needs to go through a time consuming process to ensure the update is ready.
There's even been a sort of black market for Android 2.2, with hackers able to get their hands on early builds of the OS for some devices. And even though it is meant to bring more unity to the Android community, some of the features aren't even being rolled out to all phones, making the platform different for different devices. What a headache.
For now, HTC Desire customers who hadn't yet upgraded their phone should consider themselves pretty lucky.