(this is commonly known as Nandroid backup, although it doesn’t say so in the Recovery menu) At the main Recovery screen, select “Install zip from sd card”, then choose “choose zip from sd card”.Now simply select the CM7 file on your SD card and install it.Once it is down, simply reboot and you should boot into CM7.
If you tap on a Facebook update, you'll head to Facebook for HTC and there you can comment on wall posts, or post your own status.Now make a backup through Nandroid, in-case anything goes wrong or you don’t like CM7, you can restore from the backup back to stock rooted ROM that you had before.To backup, go to “backup and restore” in Recovery and select Backup.Now restart your phone by holding down the volume down and power button simultaneously.A white screen should turn on with information regarding your cell and some menus.(Note: The download USB driver is a file, you need to extract it to your desktop and THEN select it at this step while updating the driver)Once the process is complete, Device manager should show “Android Bootloader Interface as installed).At this step disconnect the USB cable and reboot both your Desire and your PC. )Right click the Unrevoked program and Run it as Administrator, it should detect the Android cell phone (make sure USB Debugging is enabled! The program will restart your cell phone several times, which is normal, and once its done, it will say so on your PC.If you brick your device or cause any sort of hardware, software damage to it, we are in NO WAY responsible. However if you follow the guide word to word there is extremely little risk of bricking your Desire.Firstly we’ll download the files we need for the rooting process i.e the latest version of HTC Sync, Android USB Driver (hacked HBOOT drivers that need to be installed before the actual process begins, you can get them HERE and HERE) and finally the most important bit i.e. (software that roots your device and installs Clockwork Mod which is a Custom recovery mod mentioned above.At all times, a 'What's on your mind' box appears at the top of the screen.Type in a status update to send it off to Twitter and Facebook.