With this RUU package you can flash your phone to the current official OTA update - i.e. the latest software, radio and bootloader. If you have a branded phone, this will debrand it.
This method doesn't require you to root your phone and it doesn't install any unofficial or modified software. If your phone is currently rooted it will remove it.
If you install an official branded update to Froyo, e.g. Vodafone's, you will not be able to install this.
An alternative installation method that does not need any drivers (or even a computer) is available here:
Froyo (2.09.405.8) update - Windows not required
- You need a valid goldcard to apply this update to a branded phone
- This will work on all Android 2.1 software versions (HTC release 1.x)
- You need unrevoked3 3.21 to root this version, which has issues for some people.
- This update will completely wipe your phone's settings
To perform the update, back up contacts, messages, etc. with whatever method you prefer. Ensure your goldcard is inserted (if required) and power off the phone. Press the back button and the power button together until the fastboot screen appears. Plug the phone in by USB and run the RUU in Windows.
Download the RUU here:
Using an RUU is a very safe way to modify your phone's software, but there is always a risk with flashing. Do not touch the phone while it is updating and make sure your battery is full or nearly full before beginning. Orange branded phones have had several issues with updating to generic (unbranded) software. Debranding your phone may invalidate your warranty.
Will I receive OTA updates after this?
You should. You can also apply manual updates by zip files.
Do I need my goldcard for updates?
If your phone was originally branded you will need the goldcard for all unbranded updates, not just this one.
The RUU process fails.
It should only fail if you don't have a working goldcard. If you get an error about a 'customer ID', this is because you don't have one.
I get a CID error but I have a goldcard.
You don't. Try making another.
Can I downgrade my HBOOT to root this?
No. To root you must use unrevoked3 3.21 or downgrade the phone's software to Android 2.1 using this tool: [HOWTO] Downgrade Froyo (2.2) to Stock 2.1 (ANY HBOOT | WIN/LINUX/MAC | ROOT) - xda-developers
There is a leaked branded O2 Froyo update now available. This will install in the same way, except O2 phones will not need a goldcard. If you've previously applied the above debranded update, this will rebrand your phone and you will only receive O2 updates (if any more are released). Rebranding will restore your warranty if you have debranded or rooted your phone. You cannot later install the unbranded RUU above if you install this, without first downgrading your phone to Android 2.1.
HTC has released a new Froyo OTA update. You can install this directly as an RUU. You may need the latest version of HTC Sync for this version. There appear to be a lot of issues installing this RUU due to drivers. I'd recommend you install the earlier version and update OTA to this version (you can do this manually too).