[Sony Xperia Z Ultra] moazzam ali khan:
Boot Loop [A deadly issue] after lollipop update - z ultra

Below my friend is very much right. Now below is the my experience in as possible short words i can.

Actually i bought this few days ago for my parents as for gift. i already did make a hell of effort to find in the market. i have search websites, sellers, and carefully select what model i am going for its the standard version C8602. now i have kind of impression that the phone has errased and courrupted my sd card which i took it from my note 2. i wasnt smart enough to take the back of my sd card. Anyways. and i was thinking not to go for lollipop upgrade, but in case my parents accidentally update the phone and they find any issue, its better i do. And geeze lollipop surely looks okay, but when i put the charging cable for the first time, i have discovered strange thing happend, my settings all have gone, phone brightness, and blue tooth is on and perhaps more which i don't know.

and it kept on happening. now matter i reset, this or that solution, took my whole week end to solve this issue, i live in guangzhou, life is very fast here, people usually throw the electronic gadgets if they find any problem, as i am a student, so money is always hard to earn. so i spend that much time fixing it. by finding the help on youtube, sony forums and xda. but i have only discovered few people are complaining about this issue.

now i have to buy a phone, and send it for my parents, in next week time, either i buy a new one and send back to my parents living in another country, or i fix this and send back to them after testing everything is working fine.

now i am pretty low on motivation. i know sony is not good at software. and the last way is XDA. to seek help. i remember NOKIA and MOTROLLA used to create these type of problems for their customers and they didnt care to fix it, infact an attitude issue. And that caused them out of business. i will be sorry to see if SONY get out of phone business. unless SONY do something about it which matters. well i warn sony, i have been living in china for about ten years now, and i have seen chinese brands and companies developing. at now xiaomi, Huawei and others are catching up very fast. its very sad to see that international brand with their product meet issue, and the problem hasnt been resolved at yet. Guys at Sony, please do something fast about it. its not my phone. i probably buy a new one and i dont care about a little lose, but your business and phone venture could be in trouble, because of loosing credibility everyday. i still have found samsung is still going Ok with their phones. i have been using note 2 for quite couple of years, and it has been performed least on top level still today compared with any other top flagship.

last night i have decided tomorrow i will put up a post on XDA for help and if i didnt get support, i will buy another phone and never look back on sony phones. i am sorry for this. cause i cant invest more time looking on internet how to fix this. i do tell you i have tried pc companion, and other stuff. if any one here knows how to downgrade or any way, i can least put the phone in working condition. i will be greatly thankful.

Thank you friends at XDA