[HTC Butterfly 3] DarkRazorZ:
Disclaimer: You must be S-OFF and on the latest update in order to do the following. This is because the current build of TWRP requires you to flash it to the boot partition, TWRP will not work as a normal recovery (ie flashing it to the recovery partition).

There is currently no known way to S-OFF without using an unlocking device such as a JTAG or something like XTC2Clip. Sunshine will likely work if you are able to obtain root, but there is no known method of obtaining root via an exploit for the Butterfly 3 at the moment.

To check if you are S-OFF, power off the device then hold Power + Volume Down. This will boot into Download Mode where you can view if you are S-OFF or not. I am not sure if you're required to also have your bootloader unlocked in order to root, but one individual I helped was not able to root without it.

Note: If you decide to unlock your bootloader, please be aware that it will reset your device to factory settings as well as delete all photos, music, videos and any other files you have saved to your internal storage. Please move what you can to your SD card or your PC if you are not willing to lose these files.

The following command will unlock your bootloader via fastboot:

fastboot oem unlock

TWRP Information:

Team Win Recovery Project 2.x, or twrp2 for short, is a custom recovery built with ease of use and customization in mind. Its a fully touch driven user interface no more volume rocker or power buttons to mash. The GUI is also fully XML driven and completely theme-able. You can change just about every aspect of the look and feel.

CHANGELOG for 2.8.7.0:

-Initial ground work for software drawn keyboard (_that)

-Fix handling of wiping internal storage on datamedia devices (xuefer)

-Allow DataManager to set and read values from the system properties (xuefer)

-Fix crash when taking screenshots on arm64 devices (xuefer)

-Fix error message after an ORS script completes (Dees_Troy)

-Fix crashes / error when creating encrypted backups (_that, Dees_Troy)

-Add system read only option -- more details below (Dees_Troy)

-Add resize2fs and GUI option to run resize2fs (Dees_Troy)

-Fix crash loop caused by empty lines in AOSP recovery command file (_that)

-Prevent duplicate page overlays such as multiple lock screens (mdmower)

Additional Notes:

We will consider this a "beta" build as it is not used in the manner you would normally use it on other devices. The touch screen will not function if you try to flash this as a standard recovery. It will, however, fully function when flashed to the boot partition. Please take caution when flashing anything to your boot partition!

The Github for this build of TWRP can be found here.

More information can be found on the official TWRP website here.

Rooting Your Phone:

Please download the files found at the bottom of this thread. You WILL require a PC for this. Please be sure you have the latest fastboot drivers installed for your device. The generic fastboot drivers should function as well. Fastboot drivers can be found here.

Step 1:

Download the files found at the bottom of this thread. "b3 recovery.zip" contains everything you will need for this process, minus the SuperSU zip (which can also be found at the bottom of this thread).

Step 2:

Extract the contents of "b3 recovery.zip" into a folder. Place the SuperSU zip somewhere on your device, either on an SD Card or in the internal storage.

Step 3:

Power off your device completely without a USB cable plugged in. Next, hold Power + Volume Down until you boot into "Download Mode". Once you are in "Download Mode", plug your phone into your computer via USB.

Step 4:

Open Command Prompt as Administrator in the folder you extracted the contents of "b3 recovery.zip" to. Type the following command to verify that your phone is connected to fastboot:

fastboot devices

If nothing shows up, or it says "OFFLINE", please make sure your fastboot drivers are properly installed. You will not be able to continue if your device is not connected.

Step 5:

Type the following command:

fastboot flash boot b3twrp.img

This should successfully flash TWRP to your boot partition. Now type the following command:

fastboot reboot

Assuming everything went well, you should now have booted into TWRP.

Step 6:

Note: It is highly recommended that you do a full backup of your device before continuing. This will ensure that you are able to restore your device should anything go wrong and it will also allow you to receive OTA updates in the future.

Now that you are in TWRP, install/flash the SuperSU zip you placed on your device. Once it has completed, wipe your cache. Now reboot into "Download Mode".

Step 7:

Once you are back in "Download Mode", type the following command:

fastboot flash boot stockboot.img

It should flash successfully. Reboot your device.

Assuming everything went well, you should now be rooted! The initial boot will take some time and you may notice some slowdown at first but rest assured that your phone is fine and will function normally.

Downloads:

Fastboot/ADB, TWRP and stock boot image: b3 recovery.zip

SuperSU-v2.46.zip

Credits:

A big thanks and props to [MENTION=5002400]tomkins0752[/MENTION] and [MENTION=1580110]boa19861105[/MENTION] for getting this build of TWRP working for our phones. Without them, we would not have root.

If anyone has any suggestions or sees any issue with this post, please let me know and I will correct any errors.