[Xperia Z2 Q&A, Help & Troubleshooting] oguzbatu:
Hello!

My Xperia Z2 have been having a lot of problems in last 2 weeks. And 2 days ago my phone shut down it self and it is dead now.

Frist when my bootloader was locked and on stock rom I experienced battery life decrease and my phone was not able to get me through a full day but it's battery life was close to a day.

Then I decided to unlock my bootloader (I also backedup my TA before unlocking) and install CarbonROM which was fine for like 2-3 days and the battery life was better then the stock rom.

After 2-3 days my phone started to shut it self off at random moments and even say %0 battery when I had like %90 or %80 (just anything above %15)

I clean and dirty flashed the CarbonROM again and it didnt worked out so I thought it might the roms fault and I decided to install RR and it also worked fine for 1 day and then it did the same things which also happened with the CarbonROM

And I said earlier my phone just instanlty shut off at %82 battery life. After it died and I decided to put it on charge becuase I was having battery problems in last 2 weeks as I said and I thought maybe it can it fix the problem but when I pluged my phone to wall two things happened. Frist one is red charge light started blinking and the second one is Sony XPERIA logo kept blinking.

Then I tried my pc which did the same thing but when the red light go off and I pressed volume up button and my phone connected in fastboot mode then I flashed boot.img and recovery.img again and it didnt worked. Then I connected my pc again and I tried flashmode which didnt worked at frist 4-5 tries but after that my phone connected in flashmode I started to download stock kernel (.291) after while flashmode disconnected beucase I wasnt doing anything with it and I tried power button and phone booted up on RR with %82 battery life I was very glad that it worked but after 5 mins it shut it self off again and same thing again.... I managed to connect in flashmode one more time and I flashed stock .291 kernel and it was done I disconnected and powered on my phone and Sony XPERIA logo flashed for one second and the phone turned it self off.

So now I cant charge my phone beucase the red light blinks and xperia logo keeps flashing and I tried everything in Sony forums like the red button power+volume up thing bla bla. And nothing worked I will now try to leave it on charge for 2 hours and update this post but I think that it wont work.

So in conclusion I am %99 sure that battery is dead becuase when the phone boots it doesnt have any other problem expect than this battery and I am going to send it to a repair center or just but the battery it self (which costs less then 10 dollars so it is nothing too expensive) and I am sure that it isn't a software releated problem becuase if it was it would have been solved when I flashed stock kernel and rom. So what you guys think about my problem? Did anybody experienced similar problem to this or is it just me?

Note: When I press the red button while charging when the Xperia Logo keeps flashing my phone vibrates but nothing happens it just keeps blinking the red light and flashing the Xperia Logo.

Note2: My phone is like 3 years old becuase this phone was bought after 2-3 weeks after the release of the Xperia Z2.