Last night I have updated Sony Xperia XA2 Ultra dual sim to 184.108.40.206. Progress bar on update screen went all the way to completion a remained stucked od 100% the whole night. I tried to reboot the phone and after few cycles of showing white screen with sony logo it finally booted SailfishOS. I have entered PIN code and all was working fine. I have received some calls, sent some SMS, read e-mails, done some web browsing.
However after pulling the phone from my pocket later, I have discovered that it is not responding. Screen is black, buttons do not work. Holding power button does nothing. Pluging the phone to charger / USB cable does nothing, even the small LED indicator does not light up.
Tried VolumeDown + Power with USB cable plugged in and the device shows up as:
Bus 001 Device 067: ID 0fce:ade3 Sony Ericsson Mobile Communications AB QUSB__BULK
I googled it, and it may seem the phone is bricked for good. Any guidance on how to diagnose the problem appreciated.