How to update android version into Jelly Bean in Xperia U - Sony Xperia P, U, Sola, Go

Here's the details of my phone.
Model Number: ST25i
Android Version: 4.0.4 (Ice cream sandwich)
Baseband version: u8500-49020908
Kernel Version: 3.0.8+ [email protected] #1 SMP PREEMPT Mon Oct 15 14:57:07 2012
Build Number: 6.1.1.B.1.54
I'm newbie so I need a step by step tutorial. Including working download links etc.
If you still need something, feel free to post here in my thread or PM me boss.
I appreciate your help. Please!
Thanks!

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Shichiro said:
Here's the details of my phone.
Model Number: ST25i
Android Version: 4.0.4 (Ice cream sandwich)
Baseband version: u8500-49020908
Kernel Version: 3.0.8+ [email protected] #1 SMP PREEMPT Mon Oct 15 14:57:07 2012
Build Number: 6.1.1.B.1.54
I'm newbie so I need a step by step tutorial. Including working download links etc.
If you still need something, feel free to post here in my thread or PM me boss.
I appreciate your help. Please!
Thanks!
Click to expand...
Click to collapse
1st thing u have unlock boot loader
And flash stock jb rom
Look at this form their is a complete guide
http://forum.xda-developers.com/showthread.php?t=2270027

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bharathbondfire said:
1st thing u have unlock boot loader
And flash stock jb rom
Look at this form their is a complete guide
http://forum.xda-developers.com/showthread.php?t=2270027
Click to expand...
Click to collapse
I can't make that one work. After flashing kernel, it's not booting into the phone now. Just the logo and after that It's all black.
Any video on how to make that work?
Or can you teach me here? I don't really know if i'll extract it or not. That's why I need a step by step process
Thank you!

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Shichiro said:
I can't make that one work. After flashing kernel, it's not booting into the phone now. Just the logo and after that It's all black.
Any video on how to make that work?
Or can you teach me here? I don't really know if i'll extract it or not. That's why I need a step by step process
Thank you!
Click to expand...
Click to collapse
There was a step before flashing the kernel, did you skip it?

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ChikeD said:
There was a step before flashing the kernel, did you skip it?
Click to expand...
Click to collapse
The author said to "flash kernel"
Instructions:
Flash kernel Experimental v11c[JB 4.1.2] WITH FASTBOOT
Boot to recovery
Do full wipe (factory data reset)
Flash ST25i_6.2.A.1.100_unofficial.zip.
If you wipe later ILLUMINATION WILL NOT WORK!
Reboot to system
If it boots wait for SHUT DOWN button and turn off device
Turn on again, second boot will take a bit longer JUST WAIT
Everithing should work now.
Click to expand...
Click to collapse
I did as what he said. Did I skip something?

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Shichiro said:
The author said to "flash kernel"
Click to expand...
Click to collapse
I was referring to what @bharathbondfire said
[/quote]I did as what he said. Did I skip something?[/QUOTE]
Well, you obviousely did. Custom kernels are only possible to flash if the bootloader is unlocked.

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ChikeD said:
I was referring to what @bharathbondfire said
Click to expand...
Click to collapse
I did as what he said. Did I skip something?
Well, you obviousely did. Custom kernels are only possible to flash if the bootloader is unlocked.
Uhm. My bootloader is already unlocked sir. But incase it still is locked, how do I know if it's locked or unlocked?
I already know how to unlock it but how to know if it's locked or unlocked?
Click to expand...
Click to collapse

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Shichiro said:
I did as what he said. Did I skip something?
Well, you obviousely did. Custom kernels are only possible to flash if the bootloader is unlocked.
Uhm. My bootloader is already unlocked sir. But incase it still is locked, how do I know if it's locked or unlocked?
I already know how to unlock it but how to know if it's locked or unlocked?
Click to expand...
Click to collapse
How can you know how to unlock if you don't know how to check if it's locked.
in dialer type *#*#7378432#*#*, click service info, click configuration.
If rooting status is "bootloader unlocked: yes", it is locked, if it's "bootloader unlock allowed: yes(or no)" then it's not.
Click to expand...
Click to collapse

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ChikeD said:
Shichiro said:
I did as what he said. Did I skip something?
How can you know how to unlock if you don't know how to check if it's locked.
in dialer type *#*#7378432#*#*, click service info, click configuration.
If rooting status is "bootloader unlocked: yes", it is locked, if it's "bootloader unlock allowed: yes(or no)" then it's not.
Click to expand...
Click to collapse
Not because I know how to unlock it means that I know how to check if it's locked or not.
I simply followed the steps here - http://talk.sonymobile.com/t5/Xperi...rooting-Xperia-U-wilth-custom-rom/td-p/223263 few days ago.
Click to expand...
Click to collapse

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Shichiro said:
ChikeD said:
Not because I know how to unlock it means that I know how to check if it's locked or not.
I simply followed the steps here - http://talk.sonymobile.com/t5/Xperi...rooting-Xperia-U-wilth-custom-rom/td-p/223263 few days ago.
Click to expand...
Click to collapse
Have u updated ur phone to jellybean
if not,ask any required help
Click to expand...
Click to collapse