I downgraded the OS to 2.3.3 on my HTC Desire HD in an attempt to root the phone, but after doing more research into 'rooting', I found it was better that I didn't do so, but now I am not sure how to upgrade it.
Before telling me to look for software updates in the settings menu, I have tried that.
Before telling me to look for software updates in the settings menu, I have tried that.