For those of you on HBOOT 1.50, you can now downgrade your HTC Evo 3D back to HBOOT 1.40. This requires that you have a Windows/Mac and a Ubuntu(linux) computer (or you can do it all in Ubuntu). You can also use Ubuntu running on VirtualBox.
For Mac, change all adb to ./adb-mac and fastboot to ./fastboot-mac.
For Linux, change all adb to ./adb-linux and fastboot to ./fastboot-linux.
Also you will need a microUSB AC adapter.
You will need an unrooted Evo 3D, if rooted on HBOOT 1.50, follow directions here: (If not rooted, you are good to go.)
Step 1. Go to Settings->Applications->Development and make sure “USB Debugging” is checked ON and connect your Evo 3D to your computer.
Step 2. Next download hbootdowngrade.zip and unzip. Put it somewhere easy to find like I did in c:\hbootdowngrade directory.
Step 3. Open up a command prompt (or terminal for Mac or Linux) and type:
adb push zergRush /data/local/
chmod 755 zergRush
Step 4. That should have temp-rooted your Evo 3D.
Step 5. Next, type:
adb push misc_version /data/local/
adb shell chmod 755 /data/local/misc_version
adb shell /data/local/misc_version -s 1.10.651.2
adb reboot bootloader
fastboot getvar mainver
This should get you back on 1.10.651.2 version number.
Step 6. Next copy all the files except the big RUU files to your Ubuntu computer.
Step 7. Open up 4 windows, get superuser access for all:
Browse to the directory where you copied the files.
Next do this for Window 1:
./emmc_recover –flash hboot_1.4.nb0 –device /dev/sdb13
Next do this for Window 2:
./emmc_recover –flash hboot_1.4.nb0 –device /dev/sdc13
Next do this for Window 3:
./emmc_recover –flash hboot_1.4.nb0 –device /dev/sde13
Next do this for Window 4:
./emmc_recover –flash hboot_1.4.nb0 –device /dev/sdf13
And hit enter 3 times for each window.
Step 8. You can also open an additional window and type “tail -f /var/log/kern.log” so you can monitor the USB connections when you connect your Evo 3D to your Ubuntu computer later.
Step 9. Copy over the file RUU_Shooter_S_Sprint_WWE_2.08.651.3_Radio_0.97.10.0808_NV_SPCS_1.31_003_release_219445_signed.zip to the SD card of your Evo 3D and rename the file to PG86IMG.zip.
Step 10. Take the battery out of your Evo 3D and reboot into bootloader by holding down Volume Down and Power button. Your Evo 3D should load and check the PG86IMG.zip file.
Step 11. Plug-in a USB “AC” adapter to your Evo 3D and take the battery out while your Evo 3D checks for the PG86IMG.zip file. Your phone should still be on.
Step 12. When you see the screen to start update, be ready to count 4 second once you press the Volume Up button. Use a small screw driver to press the Volume Up button and count 4 seconds. At exactly 4 seconds, pull out the USB cable IMMEDIATELY. When you do this, your screen should still say “Updating”. If you saw the next step, start over from Step 10.
Step 13. Next, WHILE HOLDING DOWN Volume Down button, plug your Evo 3D into your Ubuntu computer. You should see one of the Windows flashing the new HBOOT 1.40.
Step 14. If you have successfully flashed the HBOOT 1.40, you can verify by rebooting into bootloader and seeing “HBOOT 1.40” as shown below.
Step 15. If you got to Step 15 congratulations! You can simply reboot into your Evo 3D and use the Revolutionary root method to get it fully rooted again with S-OFF.
Credits – XDA
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