For those having an issue with the never ending reboot of their Sony Xperia X Performance when trying to install, and having issues gaining access to TWRP. Please follow these instructions, it will fix all issues.

1. Start your phone in fastboot

2. In terminal make sure your device is showing up. Type "fastboot devices" and your phone should appear in the list.

3. Make sure you know the path to your TWRP recovery IMG file (twrp-3.4.0-0-dora.img). I just open terminal in the folder where the TWRP IMG resides, and then enter the following command,

"fastboot flash boot twrp-3.4.0-0-dora.img"

Remove the usb when complete and reboot the phone, it should startup to TWRP.

4. In TWRP select, "wipe", "format data"

5. Don't wipe everything, just wipe "data", "system", "dalvik", and "cache."

6. Reboot to bootloader and use UBports-installer to flash again. The installer first flashes UBports recovery, then the phone reboots and automatically goes into UBports recovery, then the system is flashed.

Let the installer and phone do their thing, it should work.

I'm not sure how long this has been going on, but I am no longer receiving incoming phone calls. I can call out, but when people try to call me it either goes straight to voicemail (which I don't get notified about) or gives a service error message.

Other phone on with the same carrier is not having this issue.

My text messages do not wrap the text, instead they just run off the side of the screen makes reading full messages impossible.

Sony Xperia X Performance

If my phone (sony Xperia X Performance) is restarted or gets out of range of my wifi signal, I have to reenter the password every time. It saves the old connection, so I have to delete a dozen profiles for the same router periodically.

For those having an issue with the never ending reboot of their Sony Xperia X Performance when trying to install, and having issues gaining access to TWRP. Please follow these instructions, it will fix all issues.

1. Start your phone in fastboot

2. In terminal make sure your device is showing up. Type "fastboot devices" and your phone should appear in the list.

3. Make sure you know the path to your TWRP recovery IMG file (twrp-3.4.0-0-dora.img). I just open terminal in the folder where the TWRP IMG resides, and then enter the following command,

"fastboot flash boot twrp-3.4.0-0-dora.img"

Remove the usb when complete and reboot the phone, it should startup to TWRP.

4. In TWRP select, "wipe", "format data"

5. Don't wipe everything, just wipe "data", "system", "dalvik", and "cache."

6. Reboot to bootloader and use UBports-installer to flash again. The installer first flashes UBports recovery, then the phone reboots and automatically goes into UBports recovery, then the system is flashed.

Let the installer and phone do their thing, it should work.

@Keneda I was doing the install on the Ubuntu side of my computer.

@CB1929 Does installing TWRP delete the OEM binaries or is that another step. I'm having the exact same issue that your were having. I completed the step above to install the binaries, and then saw your comment about TWRP. Thanks!

Thanks for the post. I went through that fix and still have the same issue. Seems like it didn't work for some other people either.

As I try to install Ubuntu Touch on my Sony Xperia X Performance. It flashes, cleans, and is on the 'preparing' when the phone boots (the message appears 'your phone is unlocked and can't be trusted, phone will boot in 5 seconds') It goes to the Sony boot screen, leaving fastboot mode, and then the Ubuntu Installer loses connection and fails to install. Any ideas what is going on?