1. Install the ROM Manager on your HTC EVO Design 4G. Get it from Android Marketplace Location, then install the clockwork mod recovery.
2. Connect your HTC EVO Design 4G to your PC employing the USB information cable. Copy the “HTC EVO Design 4G_2.3.3.zip” file you downloaded to the SD memory card.
3. Restart your device in the recovery mode using ROM Manager. As soon as in Recovery Mode, go to ROM Manager and select backup / restore to back-up your information.
4. From the Recovery Menu do a total data erase (including Delvik Cache). When completed, go back to Recovery Principal Menu and choose Flash ROM from SD Card. Navigate the location you copied the ”HTC EVO Design 4G_2.3.3.zip” file and follow the directions for installing Android 2.3.3 on your HTC EVO Design 4G. As soon as the installation is over, just reboot your HTC EVO Design 4G device, and here you go, you’ve just upgraded it to the new Android 2.3.3. Thank you for visiting Upgrade/Update HTC EVO Design 4G to Android 2.3.3