I ran into this same problem when installing on my XA2 as well but if memory serves me right It has something to do with the newer sony devices having 2 “system slot’s”. Slot a and slot b. So when going through the steps you only installed twrp on slot a. So you have to install twrp on slots a and b. And then install e on both slots. Ill get to that later. As for getting the phone to come on from where you’re at make sure the phone is completely powered off by unplugging the phone, and holding the power buttton for about ten seconds until it vibrates 3 times. Then put it in fast boot mode . then turn on Emma . and follow what was stated in previous replies. Once you get here hopefully I have gotten back to my pc so I can post the rest of the steps to finish the e install.