I installed CyanogenMod on my HTC Desire about a week ago in an attempt to get rid of some of the crapware that Orange UK are notorious for installing, and get a snappier, cleaner phone. I won’t repeat the excellent CyanogenMod install instructions, which you can find here. However, here are some points that might help you if you’re doing something similar:
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The OS (Android) firmware and the radio firmware are two separate things. The phone was at the latest Orange-approved firmware level before the upgrade (Android 2.2, which comes with the radio at version 5.10.05.30). I had read elsewhere that Orange network-lock the phone and that this sometimes causes problems when installing CyanogenMod; so I deliberately removed the SIM card during the upgrade process as suggested. Whether this circumvented the problem or whether it simply wasn’t an issue I can’t say, but certainly I haven’t seen any network-lock problems. I didn’t upgrade the radio at all, as this seemed risky; I simply left it at the 5.10 level and skipped over that section in the install instructions.
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