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Unbrick Xperia Z2

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By schwags, Senior Member on 23rd August 2014, 10:09 PM
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OK, I decided to put a custom ROM on my Z2 today. I did not unlock bootloader, but installed NUT's Dual Recovery. It booted, installed ROM fine. I decided I wanted to reinstall to change some settings, wiped data and davlik, rebooted (by accident), and now I'm just suck at SONY logo on boot. Please help, not sure how to fix this. I can power off by Power Button + Volume Up, or the red button on left side. I just want to get it back into recovery so I can reflash, or whatever I need to do to revive it. Searched around, not finding much to fix it. Please help!
 
 
23rd August 2014, 10:47 PM |#2  
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Quote:
Originally Posted by schwags

OK, I decided to put a custom ROM on my Z2 today. I did not unlock bootloader, but installed NUT's Dual Recovery. It booted, installed ROM fine. I decided I wanted to reinstall to change some settings, wiped data and davlik, rebooted (by accident), and now I'm just suck at SONY logo on boot. Please help, not sure how to fix this. I can power off by Power Button + Volume Up, or the red button on left side. I just want to get it back into recovery so I can reflash, or whatever I need to do to revive it. Searched around, not finding much to fix it. Please help!

I at least have it in fastboot mode, and can see the device when running the fastboot command. Someone please help...
23rd August 2014, 11:46 PM |#3  
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Flash ftf with flashtool.

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23rd August 2014, 11:51 PM |#4  
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Originally Posted by o0 Matt 0o

Flash ftf with flashtool.

Sent from my D6503 using Tapatalk

OK, I at least got that far using proper instructions, still doesn't boot though, stuck at SONY logo.
24th August 2014, 12:02 AM |#5  
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Nevermind, it worked now. It was telling me some weird instructions, had to have it in fastboot, unplug and plug back in again without doing anything. It's booting now. Why would this happen? Maybe I just need to unlock my bootloader?
24th August 2014, 05:14 AM |#6  
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Quote:
Originally Posted by schwags

Nevermind, it worked now. It was telling me some weird instructions, had to have it in fastboot, unplug and plug back in again without doing anything. It's booting now. Why would this happen? Maybe I just need to unlock my bootloader?

No, it has nothing to do with unlocking your bootloader. If you were using flashtool you probably didn't plug it in in the correct mode.

As for unlocking your bootloader, read the instructions on any ROM's OP. It will tell you whether it needs an unlocked bootloader or not. Sony stock based ROMs sometimes do and sometimes don't. AOSP based ROMs do need an unlocked bootloader as that is needed to flash a custom kernel. If you do want to unlock your bootloader, read up on how to root your device first without unlocking and then read up on how to back up the TA partition of your device. This partition is effectively your warranty and contains the DRM keys to all of Sony's proprietary software. If you unlock your bootloader without a backup, you lose your DRM keys and they are non retrievable. Thus, if you want to send the device off for a repair, without restoring the TA partition you cannot restore your warranty and it will be declined. Having your TA partition backed up means that if you ever need to send it off, you can restore it and this locks your bootloader and reverses any DRM key loss.

If you have any further questions please ask before doing anything. We can only help answer questions if you ask them
24th August 2014, 10:28 AM |#7  
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