Xperia Companion solved this problem. It took some time to find the way, so I'll leave an instruction (follow it at you own risk, I am an idiot). And, of course, you'll lose all your applications and data. - charge your phone - install Companion and connect your phone, so it will install drivers and stuff - disconnect your phone - run Recover tool from Companion - check the option "My Device is not recognized, or SmartWatch something" - choose device type "Xperia Phone" - wait until Compation finish some preparations - connect your device (yes, Companion instruction says otherwise, but I dont know how to turn off bricked phone) - hold Power+VolUP, device will start reboot process - after vibro signal hold VolDown - you'll see green led light - click Next and Companion will start recovery process I had to do this twice (may be I have done something wrong on my first attempt) Now I have software version 50.1.A.13.123 and android 8. Phone says, that he is up to date, I suppose, that this funny update was called back P.S. Sony! I needed this instruction 24 hours ago!
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