Z3 won't boot - Xperia Z3 Q&A, Help & Troubleshooting

Good morning, I bought yesterday this phone, version D6603.
When I started it android version was 4.4.4, so I tried the Sony update to see if any update was available, and it suddenly started the download; so I stopped it and turned off the phone (I just wanted to install a recent stock rom with flashtool with a data wipe, because the phone is a secondhand one). After a while I turned it on again, just to check the camera, and when I started it the screen went black and the phone has locked and turned off by itself! I cannot manage to boot it again, neither in normal nor in recovery mode (I tried volume down + power, volume up + power, both + power). I had to reset it several times with the physical button because every time it get stucked on boot!
So next step was to try to install a stock rom with flashtool (D6603_23.4.A.0.546_IT), using wipe apps_log and userdata; it worked with no errors but the phone was still stucked on boot (just after the welcome music).
I also tried to use PC Companion's "repair your phone" under Support Zone, but it didn't work as well.
At this point I don't know what else I can do, I tried everything I know! I always had Sony and it's the first time I got a stucked phone with no root and nothing else modified.. Any suggest??
Thank you very much

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[Q] Unable to format/wipe/reset nexus s

I have a nexus s i9023, it was running well with 2.3.4 for three months. Got an OTA update for 2.3.6 two days ago, installed it.Im running stock, and the root is locked.
Everything seemed to be running fine on 2.3.6 when last night it just stopped responding and freezing. Taking battery out doesnt help, it again freezes at the colorful x logo or at the unlock screen.
I read on how to do a reset, but pressing volume down and power button gives me only a flash of blacklight (for a millisecond) and then nothing happens. tried it many times. What am I doing wrong?
Pressing volume up and power button gives me a fastboot menu, and recovery mode only gives me an exclamation mark android, then I have to take battery out again. I cannot mount the sd card or do anything else.
Any help or solution is most appreciated guys. Salute.
When you get to recovery, press again power+volume up (i think so), and you'll get some options. You can make factory reset there (as i can remember).
Also, there are many guides here on how to root and flash custom recovery via fastboot.
Check this out: http://forum.xda-developers.com/showthread.php?t=1007782
Just follow it, and when you flash custom recovery, you will be able to mount SD card, flash any ROM etc...
Good luck ...
i have the exacly same problem and i already try full wipe, install other ROM like oxygen and i cant pass the main logo... it's frozing all the time and i need pick up the battery to turn it off... :S
someone can help?

My Galaxy Tab 7.0 plus (GT-6200) suddenly died, help please!

The unit has been used for about 2 months and remains quite new. It was quite stable before. Yesterday night, about half an hour after plugged in for charging and with WiFi Hotspot turned on for sharing 3G data to another netbook, the unit suddenly rebooted itself. It then stopped at the start-up screen and remained there for several minutes. I kept holding the power button for a few seconds to turn it off but it then automatically reboot itself afterwards, and stopped at the start-up screen again. It means that even complete turning off is not possible.
Trying to enter into recovery mode showed the following few lines:
# MANUAL MODE #
-- Updating application...
Copying Common Apks.
Click to expand...
Click to collapse
and then it automatically rebooted again. It means that it can't enter into recovery mode normally.
It was possible to enter into download mode. And it was the first time this machine went into download mode. I run Odin Downloader and flashed the official stock ROM. After showing "Pass", the device rebooted itself. Unfortunately, it still stopped at the start-up screen, just showing "Samsung Galaxy Tab 7.0 plus". It is really troubesome. I have experience playing several Android devices before and it is the first time I face such troublesome problem.
The device is an official product. The biggest problem is that the original purchase invoice was lost and most likely that I couldn't get official support, repair service or replacement.
May I ask if anyone would kindly provide me some help or advice. Thanks!
Instead of going into download mode go into recovery mode and see if there are any errors. Your scenario is sounding very similar to the one I had in the past.
I just ran into a nasty snag at boot logo as well. nandroid, stock kernel and factory reset were no help. Try Odin back to Stock, it still may not get past boot logo, hold vol up and power to get into recovery and factory reset. Hope it works for you.
Unfortunately I was unable to get into recovery mode even after odin flashing stock ROM.
It rebooted itself a few seconds after displaying some lines of text. I can't see the normal recovery menu.

Problem with boot loop

Hello.
I got stuk on the firmware update screen after a factory reset that never rebooted (Maybe it's because I'm having a problem with the USB port. Anyway I tried this guide http://forum.xda-developers.com/showthread.php?t=2663369 for flashing stock jelly bean (I was already in there before the softbrick) and everything went perfect, it rebooted to android, powered back of and got a PASS message at the end, but after I unplugged the phone and powered ON I got the Firmware Update screen again.
Tried another time but I decided to stop the process once it reboot to android, the phone it worked fine as long as I keep it on, if I power it off I will get the damn Firmware Update screen again after I power it ON. Also if I try a factory reset it will reboot to that screen.
Thanks in advance.

LG Logo Bootloop - Can't access TWRP - No DL Mode

Hi guys,
New to flashing custom ROMS. Good news - flashed CM12, then LiquidSmooth and I'm learning a lot after having soft bricked my phone a few times. Bad news - After trying to get back to Stock I'm not able to get out of this LG Logo bootloop. The LG logo will flash, screen will go black and the whole process starts again. It doesn’t progress past that. I'm unable to get to TWRP recovery or download mode.
My idiotic move:
Iffy stability with camera and mobile data with CM and LiquidSmooth. Decided to go back to Stock.
I flashed my nandroid backup, which I believe led to a bootloop (can’t remember). Was able to boot to TWRP and get back to CM12. Then I had the genius idea of using AutoREC and selecting the “Go Back to Stock” option. Yes, it’s already sounding like a bad, and nonsensical idea as I say it now. Can't remember exactly what I did next - I either flashed my nandroid backup or did a factory reset through CM settings. Threw me into this bootloop.
The details:
Model - D800 - Am sure of this.
Stock software before flashing CM12 was Lollipop 5.0.2 via OTA.
TWRP Recovery 2.8x something or other. Used AutoRec to flash.
I can interrupt the bootloop and access Factory Hard Reset through Power + Volume Down
Had to go to JB Bootloader in order to Flash ROMs. Errors returned otherwise.
Roadblocks:
No download mode. Holding Volume Up & Inserting USB cable doesn't work. Although am able to get bootloop to include a blank screen with red flashing LED through this method from time to time.
Phone boots up, and goes directly into bootloop when plugging USB cable into phone. This happens both when plugging into a wall charger or into a computer. I think this is probably the biggest pain and is holding up things from progressing. Can turn off phone by holding down power for a few seconds, BUT if the phone is plugged in it will continue to boot on its own.
Phone not recognized by computer & ADB However, was at times able to get Device Manager to recognize the phone as an "Unknown Device" after going to the Factory Hard Reset screen. This is no longer working after trying different drivers. I’ve went through LG Mobile Universal Driver as well as the Koush driver.
Going through Factory Hard Reset via hardware buttons only throws phone back into BootLoop
Can’t boot into TWRP
Any insight or help guys? Thanks in advance. I think getting into Download Mode will be a quiet victory. I’d like to try to use Supersports guide once I get there to go back to stock.

[Completed] Sony xperia Z2 stuck in a loop.

Hi. I started the process of trying to root my Sony xperia Z2, which was running Android MM (6.01),but its all gon a bit pear shaped.
I have successfuly installed Flashtool on my laptop, and was downgrading to lollipop 5.1.1.
Flashtool went through the flashing process and seemed to finnish correctly.
However, upon re-starting the phone, it went through the process of updateing the opperating system, but when it had finnished and started up, it stated "andrdoid.process.acore has stopped". Pressing ok brought up "android.process.media has stopped". Pressing OK simply re-starts the phone and goes back to "andrdoid.process.acore has stopped"
Have tried to enter restor mode (vol down+power button) but it simply starts as normal.
Have tried flashing to a differant opperating system (5.0.1), and still the same (though it now goes through the Android is upgrading screen after every re-start.
How can I break this cycle? PC Companion is auto starting but not connecting to the phone either.
Thanks
Darren

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