Develop Bugs

[Q] about bootloader

Hey guys I love my xperia but... The stock rom suckssssss. And cause my bl is locked most of the custom roms won't work on my phone...
I oppened this topic to know if someone knew what exactly is the bootoader unlocking I mean how it works (do bootloader unlocker delete and rewrite the bootloader or juste change a setting in it? Can it ne done with the developplment tool? Etc...)
Plz do not explain me that bootloader unlocking is the process that I need to install custom roms etc... I know what it is but I want to understand HOW it works.
Sry for my bad english if you can't understand something just ask me
Sent from my LT15i using XDA

to simpifly, you can think that the bootloader is like a safety-system. The sony makes it to accept their rom only and block others, like a kind of filter. When you unlock it, the bootloader will accept all roms, no limits.

Yup I know that but what makes this programm so difficult to rewrite? I know that its the programm that run before the os but why nobody founds a hack to unlock it without paying? Is it too hard or sony forbid free unlocking?
And again my question how does bootloader works? If someone know the code could it copy it?
Sent from my LT15i using XDA

thefirecrow said:
Yup I know that but what makes this programm so difficult to rewrite? I know that its the programm that run before the os but why nobody founds a hack to unlock it without paying? Is it too hard or sony forbid free unlocking?
And again my question how does bootloader works? If someone know the code could it copy it?
Sent from my LT15i using XDA
Click to expand...
Click to collapse
It is for free. Sony created a website purposing for unlocking bootloader for those who want to unlock.
Its easy to unlock bootloader nowadays. When im was using my xperia x8, it took 8 freakin months to bypass the bootloader...
Sent from my LT18i using xda premium

Oh boy, you missed a lot here. Take a look at guides in the general threads.
Its free to unlock bootloader
The imei way unlock (DRM data loss)
Testpoint unlock (no loss, fully safe), easier to relock and nobody can know if it was unlocked or not
Sent from my sexy LT15i

But... My phone is branded... (bootloader unlock allowed : no) and my question is not WHAT is bootloader but HOW does this **** works (code etc..) but anyway thanks for trying
Sent from my LT15i using XDA

[LT18i] unlock bootloader without losing DRM ?

I did search the forum, and found methods for Arc, but none for the Arc S.
Is there any way ?
Also what are the disadvantages of losing DRM? Read somewhere TrackID and Timescape won't work. I can live with that. Anything more ?

timescape work fine in my lt18i with an unlocked bootloader

They use the same methods.
http://forum.xda-developers.com/showthread.php?t=1304634

Really good guide,I've learnt alot of good new things,appreciate the time and effort you've put into it.
Sent from my LT18i

As i know you can't unlock your bootloader at the moment without lose the DRMs.
Use the offical way.

You can unlock bootloader without loosing drm via testpoint paid service with setools
Sent from my X10i using xda premium

What are the disadvantages of losing DRM ?

eliksir said:
What are the disadvantages of losing DRM ?
Click to expand...
Click to collapse
You lose the ability to use things like Trackid

Read from somewhere, that test point method is not supported on Arc S, but is supported on Arc. Someone tell me more.

cuese3 said:
As i know you can't unlock your bootloader at the moment without lose the DRMs.
Use the offical way.
Click to expand...
Click to collapse
Official method only works for generic, unbranded phones. If your phone was purchased through a carrier, its bootloader cannot be unlocked.
zolaisugly said:
You can unlock bootloader without loosing drm via testpoint paid service with setools
Click to expand...
Click to collapse
SETool1 doesn't support the arc s (LT18i), only SETool2 which requires hardware and paid credits.
Frequently Asked Questions about the bootloader:

In short, with the available methods, i'll lose DRM on my LT18i if i unlock the bootloader, right ?

[Q] DRM still lost after unlock via testpoint

Hi, everyone
I have my experience about unlock bootloader, I have unlocked bootloader via official Sony method, when DRM lost, I decided to relock again, flash stock FW via flashtool and repair via PC Companion, after that DRM has been recovered.
So, I've tried to unlock bootloader via testpoint using S1tool, after unlocked, flashed custom kernel and ROM. DRM still lost
Any solution ?

danisariandi said:
Hi, everyone
I have my experience about unlock bootloader, I have unlocked bootloader via official Sony method, when DRM lost, I decided to relock again, flash stock FW via flashtool and repair via PC Companion, after that DRM has been recovered.
So, I've tried to unlock bootloader via testpoint using S1tool, after unlocked, flashed custom kernel and ROM. DRM still lost
Any solution ?
Click to expand...
Click to collapse
When you unlocked via Sony method, you lost your DRM forever . There's no way to recover it. So, I'm pretty sure you're mistaken about the recover of the DRM keys.

panda0 said:
When you unlocked via Sony method, you lost your DRM forever . There's no way to recover it. So, I'm pretty sure you're mistaken about the recover of the DRM keys.
Click to expand...
Click to collapse
When I claimed warranty, I relocked, repair via PC Companion, DRM worked ( transfer music via media go works ) then when I unlocked via testpoint, DRM LOST !! IT'S IMPOSSIBLE

danisariandi said:
When I claimed warranty, I relocked, repair via PC Companion, DRM worked ( transfer music via media go works ) then when I unlocked via testpoint, DRM LOST !! IT'S IMPOSSIBLE
Click to expand...
Click to collapse
Never heard of a way to restore the DRM Keys after unlocking via official method. There's some thread that explains this? I've read from many sources (xda, setool) that once you unlock the official way, you lost the DRM keys forever.

Maybe when I repaired via SUS, DRM recovered

danisariandi said:
Maybe when I repaired via SUS, DRM recovered
Click to expand...
Click to collapse
That's not possible AFAIK. I've searched again and the only thing I found is: You lost your DRM Keys.
DRM Keys are stored in a trim area and when you unlocked with the official method, they're erased. SEUS or SUS can't restore.
At least that's what I've read about this.
Btw, I sent my previous lt18 to Sony warranty without the Keys and they returned a new one. So, the fact that they didn't complain, doesn't mean much. But let's wait for more experienced members opinion. That's all that I know about this.

Ok thanks, I'll kepp my warranty as well

Have you read this post about retrieving drm keys http://forum.xda-developers.com/showthread.php?t=1855798
Sent from my LT15i using xda app-developers app

cokey77 said:
Have you read this post about retrieving drm keys http://forum.xda-developers.com/showthread.php?t=1855798
Sent from my LT15i using xda app-developers app
Click to expand...
Click to collapse
I've read it now. Let's focus some points:
No.. Working Music info download or Track ID does not prove that DRM is recovered. There are workarounds to make stuff like FBMedia like or TrackID work..
From: http://forum.xda-developers.com/showpost.php?p=30815987&postcount=11
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Yes I know what you are saying.. Like I said using your method does make em work(there are other work arounds too).. but the DRM is not recovered. The system is just fooled..
From: http://forum.xda-developers.com/showpost.php?p=30823437&postcount=15
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Click to collapse
The only post that supports that might be possible is this one (but, in my humble opinion, this is just a bogus information):
Some info from MDPI device forums.
They have been saying, that just relocking bootloader and unlocking via test point method recovers DRM. No need to reflash ROM/kernel or anything else. Neither you need any Walkman apps or stuff.
Click to expand...
Click to collapse
I strongly believe that like heinrichkaiser said in that thread: This method make the apps work, fooling the system, but don't restore DRM.
They even linked some topics in the setools forum, and no one (even the_laser) could confirm that there's a way to restore. That doesn't mean that it's impossible to make some functionalities work after the loss of the DRM Keys, as you can read here:
ok here's the simple steps after unlocking bootloader.
1. Uninstall the old TrackID (its a system app so u need root)
2. Download the latest TrackID on android market (the silver one/not the old blue)
3. Backup the FBMusicLikes.apk/Music Likes app
4. Uninstall the FBMusicLikes.apk/Music Likes app (its a system app so u need root)
5. Reinstall the FBMusicLikes.apk/Music Likes app
6. connect to net and try it, its now working again.
thanks to rioener for this discovery
Click to expand...
Click to collapse
EDIT: Other post Blagus in the "[Tutorial] Relock bootloader!" thread.
You still can't get DRM back. It's gone from the phone!
From: http://forum.xda-developers.com/showthread.php?t=1134335
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Click to collapse
+1 Thread about it:
http://forum.xda-developers.com/showthread.php?t=1404972

After Unlocked Bootloader

Someone please tell how many thing that is cannot use anymore after unlocked bootloader?
What i know right now is after unlocked bootloader is the drm will gone, that i can't use the stock trackid(need to download the new one from google play) and i can't use to register my phone via the first setup. what else that many of things that cannot use it after unlocked?
I really want to know about this world of android, lol~
(But before this, after i unlocked it for the first time, i still can use trackid and registered the phone.
Its happen after i relocked and unlocked so many time but not in the same day. HAH~ Silly me~)

HEZAiKU said:
Someone please tell how many thing that is cannot use anymore after unlocked bootloader?
What i know right now is after unlocked bootloader is the drm will gone, that i can't use the stock trackid(need to download the new one from google play) and i can't use to register my phone via the first setup. what else that many of things that cannot use it after unlocked?
I really want to know about this world of android, lol~
(But before this, after i unlocked it for the first time, i still can use trackid and registered the phone.
Its happen after i relocked and unlocked so many time but not in the same day. HAH~ Silly me~)
Click to expand...
Click to collapse
That's it I think, I can also still use register thing though. New track Id works but prefer shazam.
Sent from my R800i using Tapatalk 2

Hmmm, still can u check app that call music & video. Originally from stock, maybe have a connection with the facebook. I can't use this app anymore.(maybe this app have been too old).
Sent from my R800a using Tapatalk 2

[Q] Xperia S - Any Progress Unlocking Bootloader

As subject says has there been any progress in being able to unlock the bootloader when it says "NO" on the phone ?
I really like my Xperia S, but I'm getting increasingly frustrated by Sony's snailpace updates. I'd love to put CM10.1 on it but currently have no way to :crying:
Thanks

Sorry, friend , but I don't think its possible.
Sent from my LT26i using xda premium

I've heard that there might be small chance of unlocking fastboot by removing the netlock. However, I'm not sure. For some people, it was just necessary to flash another ftf...
BTW, I have the same problem as you and if I find a solution, I'll let you know...

Only SONY authorized service can do that for you, but there is a chance they won't.