1. Windows Only: Download & install the HTC Sync drivers: Download

   md5: f60771a86c4ad69c8c9c1d158e60e850

2. Disable fastboot on the Desire (GSM) (Settings » Power » Fastboot) or (Settings » Applications » Fastboot).
3. Make sure USB debugging is enabled on the Desire (GSM) (Settings » Applications » Development » USB debugging).
4. Connect the Desire (GSM) to the computer via USB.
5. Write down the HBOOT version of the device
   • To find out the HBOOT of the device, boot into the bootloader by powering off the device and power back on holding down Volume Down & the Power button or via adb reboot bootloader.
   • If your HBOOT version is NOT 0.93.0001, 1.02.0001 then do not run the tool and contact the Revolutionary team for support availability.
6. Write down the serial number of the device
   • The serial number can usually be found under the battery, on the box or via adb devices / fastboot devices
7. Download Revolutionary 0.4pre4: Download
8. Fill out the form on the Revolutionary site to get a beta key.
9. Once you have the beta key, launch the Revolutionary beta (you may need to launch it as root or administrator) and enter in the beta key minding that the key contains both upper- and lower-case letters.
10. Revolutionary will now attempt to temporary root the Desire (GSM), set S-OFF & install a custom recovery image. The device will reboot on its own and the entire process should only take a few minutes. If the process takes longer than 15 minutes, reboot the device and attempt again. Some users have had to attempt gaining S-OFF multiple times before achieving success.

    NOTE: If any time during this process you are having excessive amounts of issues, please join the Revolutionary IRC channel for further help 

Installing CyanogenMod from recovery

1. Download the prebuilt release of CyanogenMod you wish to install. (Or if you've built CM yourself, look in the $OUT directory for the .zip.)

   Optional: Download any supplemental 3rd-party applications packages for the device you wish to use.

2. Place the CyanogenMod rom .zip file on the root of the SD card using adb:
   • Transfer your file(s): adb push YOURROMZIP.zip /sdcard/
     • If you boot directly to recovery and have an internal sdcard, you may need to run adb shell mount /sdcard or mount data through the recovery menu before transferring.
     • If you see "error: device not found" there is likely a driver issue on the PC.
     • If you see "error: insufficient permissions for device", try "adb kill-server" and then run "adb devices" to see if the device is attached.
     • On some devices, the zip file can be copied to the device using standard USB Mass Storage or MTP support. Boot the device normally and transfer the file to it.

   Optional: Place any supplemental packages (e.g. Google Apps[1] or kernel) .zip file(s) on the root of the SD card.

3. Boot to recovery mode on the device by holding Vol Down & Power then select recovery. Use the optical key as select..
4. Once the device boots into the ClockworkMod Recovery, use the physical volume buttons to move up and down. On most devices, the power button is used to confirm your selection, although for some devices the power button is used as a "back" button to go up one level, in which case the home button is used to confirm the selection.

   Optional/Recommended: Select backup and restore to create a backup of the current installation on the device. If this option is missing, it's likely because the stock ROM has overwritten your custom recovery on boot.

5. Select the option to wipe data/factory reset.
6. Select install zip from sdcard.
7. Select choose zip from sdcard.
8. Select the CyanogenMod file you placed on the sdcard. You will then need to then confirm that you do wish to flash this file.

   Optional: Install any additional packages you wish using the same method.

9. Once the installation has finished, return back to the main menu, and select the reboot system now option. The device should now boot into CyanogenMod.