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[Q] stuck at boot

OP scruffyb94m

16th February 2014, 05:48 PM   |  #1  
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Hi everybody,

after reading about how to upgrade & root the Xperia SP on the 4.3 firmware I followed the guides to get everything set up.
Now, after being nearly there I'm stuck with a black booting screen.
Here follow the steps I did undertake so far, any help to resolve my issue would be very welcome.

I started with firmware 12.0.A.2.245 rooted with Doomlords method (flash old kernel, root, flash .245 kernel again)

1 backup contacts/messages etc
2 do TA partition Backup with Backup-TA
3 update firmware using PC-Companion
4 unlock bootloader with official sony guide
5 fastboot flash cwm / superSU

---> everything worked fine so far (phone was operational), now I wanted to get the screen mirroring working - meaning the bravia engine. So I went for

6 Backup-TA check backup integrity with dry restore
7 Backup-TA restore TA partition

last step of the restore was: reboot device, which got me to the black screen - which is where I am stuck now.

All I managed so far is entering the fastboot mode, I could confirm this working by issuing a "fastboot devices" which listed the phone as available.

Anyone got any ideas to what went wrong and how to fix this?
16th February 2014, 06:03 PM   |  #2  
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update: after going through the unlock bootloader procedure again the phone boots normally again ( fastboot.exe -i 0x0fce oem unlock 0x[...] ) . Now the last problem is getting the TA partition back.
Is this even possible while keeping root?
16th February 2014, 06:08 PM   |  #3  
Deepam7325's Avatar
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Flash stock kernel .266 before restoring TA partition.
go to flashmode and flash the kernel.ftf, links of which can be found by searching.
this problem has been posted as FAQ in Bootloader unlocking relocking thread.
Last edited by Deepam7325; 16th February 2014 at 06:11 PM.
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17th February 2014, 08:50 PM   |  #4  
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Thanks! I'll try this. I thought you only had to reflash the stock kernel if you wanted to relock the bootloader
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