Xperia Z3 boot loop after TWRP installation My Xperia Z3 was running Android 5.0.2. The model is D6653. I didn't check the firmware build number.

I followed these steps.  

Everything was successful with no errors.

➜  Sdk  sudo $(which fastboot) devices             
[sudo] password for eric: 
➜  Sdk  sudo $(which fastboot) devices
CB5A276UDL  fastboot
➜  Sdk  sudo $(which fastboot) flash boot ~/Downloads/bootZ3monxtest01\ \(1\).img
sending 'boot' (13056 KB)...
OKAY [  0.413s]
writing 'boot'...
OKAY [  0.875s]
finished. total time: 1.288s
➜  Sdk  sudo $(which fastboot) reboot
rebooting...

finished. total time: 0.051s


Now my phone is just flashing TWRP logo repetitively - I cant' go into recovery.  I can't even get into fastboot mode anymore so I can't execute any more commands from my computer.  

I'm using a Ubuntu laptop.

What should I do e.g. try to install another recovery like this one?
Now that you can enter into fastboot, you can execute the commands below
fastboot flash recovery ~/Downloads/bootZ3monxtest01.img
and fastboot reboot and install a custom rom.

flash boot boot.img is used to flash kernel images.
boot.img is a file which contains kernel and ramdisk.

More on Boot &amp; Recovery images can be found here