Unlocking bootloader Xperia SP

[haaskjel79]

Not able to unlock bootloader on my Xperia SP. When i try to update the S1 fastboot driver as showen on the youtube video posted on sony's site i'm getting a message that says that it's not able to install driver 'cause i looks like the hash-code, or part of it, is missing. Want to upgrade to kitkat but it seems difficult. Been able to root it by using towelroot, but it stops there. Installed quick root app for recovery start but that doesn't work either.

What can i try next?

[Thommo]

Try this on XDA

[Larek]

Is that Windows 8.1 on the PC your XSP is conected to? If yes, you need to switch off checking drivers signature.

[haaskjel79]

yes that worked, thank you.

But still not able install kitkat. Tried to use flashtool but it didn't work. Got this message:

08/005/2015 17:05:26 - INFO  - Flashtool Version 0.9.18.4 built on 12-05-2014 22:00:00
08/005/2015 17:05:26 - INFO  - Executing search strategies to find proxy selector
08/005/2015 17:05:26 - INFO  - No proxy found for IE. Trying next one
08/005/2015 17:05:26 - INFO  - Proxy found for firefox
08/005/2015 17:05:26 - INFO  - Syncing devices from github
08/005/2015 17:05:26 - INFO  - Scanning devices folder for changes.
08/005/2015 17:05:38 - INFO  - Pulling changes from github.
08/005/2015 17:05:39 - INFO  - Devices sync finished.
08/005/2015 17:05:44 - INFO  - Device disconnected
08/005/2015 17:05:46 - INFO  - Selected Bundle for SonyEricson X10 (X10). FW release : V1. Customization : BLRelock
08/005/2015 17:05:46 - INFO  - Preparing files for flashing
08/005/2015 17:05:46 - INFO  - Please connect your device into flashmode.
08/005/2015 17:05:54 - INFO  - Device connected in flash mode
08/005/2015 17:05:54 - INFO  - Opening device for R/W
08/005/2015 17:05:55 - INFO  - Reading device information
08/005/2015 17:05:55 - INFO  - Phone ready for flashmode operations.
08/005/2015 17:05:55 - INFO  - Current device : C5303 - YT910ABVCQ - 1272-3336_R3B - 1269-3538_12.1.A.1.205 - GLOBAL-LTE_12.1.A.1.205
08/005/2015 17:05:55 - INFO  - Start Flashing
08/005/2015 17:05:55 - INFO  - Processing loader.sin
08/005/2015 17:05:55 - INFO  -     Checking header
08/005/2015 17:05:55 - ERROR - Processing of loader.sin finished with errors.
08/005/2015 17:05:55 - INFO  - Ending flash  session
08/005/2015 17:05:55 - ERROR - ERR_SEVERITY="MAJOR";ERR_CODE="0019";ERR_DYNAMIC="SIN header verification failed";

Where do i go next? Not even able get to recovery mode......

[haaskjel79]

Trying to update my sp to kitkat. Been able to unlock bootloader and root the phone, but i'm stuck from that point. Not able to get acsess to the recovery boot/option. Tried the quick boot app or try to boot it from the computer.

How do i proceed from here.

[Thommo]

not sure if you think rooting will allow Sony to update your device to KK as this will not happen - You have either been misinformed or have been reading about custom roms, if the latter is the case then visit XDA about custom roms and how to install such things

[Harald731]

Easy method number 1: Cyanogemod 11

Easy method number 2: Paranoid Android

I installed the first option at first and it was a huge inprovement over these terrible roms from Sony. The latest version turned out to be a bit laggy and it doesn´t get developed anymore so I desided to go for the Paranoid Android. After a day of use it has turned out to be way lighter than Cyanogemod. Both work just fine and way better than Sony roms.

No need to unlock the bootloader but you have to root to be able to install the recovery to get the whole thing started.