Tutorial: HTC Evo Design 4G - Downgrade From ICS To Gingerbread

[sanju_barc 51]

GB downgrade instructions:

Download zip (containing three files you will need) from the link: http://d-h.st/clE

1. unlock your bootloader if you haven't already and flash recovery in fastboot.

2. After you have unlocked your bootloader and flashed custom recovery, download the above zip and extract the contents to your desktop. You will need to place the system.img file on the root of your sdcard. The other two files (boot_signed.img and recovery_signed.img) go in the platform-tools folder of the SDK that you should have installed on your computer already.

3. Next, boot into CWM Recovery and create a backup. You can access recovery from the bootloader screen by powering off the phone. After it's been powered off for a moment, press and hold Volume Down then press and hold Power. This will boot you into hboot where you will select Recovery to boot into recovery.Should you run into any problems you will need to restore this backup because the next step is to wipe data, cache, and system. After that mount your sdcard in recovery under the mounts and storage option.

4. Next, plug your phone into your computer and open a command prompt, then run these commands without quotations:

"cd C:\android\platform-tools" (or wherever you have the SDK installed on your computer)
"mount /sdcard" (you can skip this if it gives you problems and you mounted your sdcard already in recovery)
"adb shell" (the cursor in command prompt should turn into a #)
"dd if=/sdcard/system.img of=/dev/block/mmcblk0p26"

The last command will look as if nothing is happening, but this is normal. The system.img file is 800mb, so it will take a 5 to 10 minutes to flash. Just be patient. You will see a line in command prompt telling you how long it took to flash system.img and this is when you can move on the next step.

5. After it finishes, remove the battery cover and pull the battery. Wait about 15 seconds and replace it, then boot into hboot by holding Vol down then pressing and holding Power until the splash screen comes on and your on the hboot screen. Select fastboot. Next you need to open the command prompt again and run the following commands:

"cd C:\android\platform-tools" (or wherever you have the SDK installed on your comp)
"fastboot flash recovery recovery_signed.img" (same with flashing system.img you will get a message telling you how long it took to flash before you can move on to the next command)
After this command finishes run:
"fastboot flash boot boot_signed.img" (same as system.img you have to wait for the completed in so and so seconds before moving on)
After this finishes you have to relock your bootloader with this command:
"fastboot oem lock" (you can't skip this step)
You can use command prompt to reboot by using the command "adb reboot" or go back to hboot on the phone and select reboot.

It will take a while to reboot as the phone is regenerating its cache, so be again be patient. It can take up to five minutes. Any more than that and something probably went wrong. You should now to be running stock Gingerbread.

If you still have the Unlock_code.bin file that you got emailed to you from htcdev.com when you unlocked your bootloader you can place it in platform-tools folder of the SDK and use fastboot in command prompt to unlock your bootloader with the following command if you want to root your phone with the above posted guide:

"fastboot flash unlocktoken Unlock_code.bin"

This step is only necessary if you want to root your phone, and it's much easier than going through htcdev.com again. This is a successful method suggested by XDA member. I have personally executed it. Try at your own risk.

Thanks