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In this thread I intend to give some basic insight about these two concepts, which are closely entwined with our phone's experience. I'm not a tech guy, but I think this little summary might clear some doubts for people who are new to this kind of issues (people who come from other non-Android phones especially). All feedback is welcome, in particular the one of people who can expand the topic with their knowledge.
"Root" is the common way to refer to the fact to the user account which has superuser rights on the device. Superuser rights imply full control over your phone's capacities, which are determined by the software and the hardware of the device. Non-superuser accounts have limitations, usually established for the sake of software security (for example, not allowing a user to disable critical functions such as phone or GPS), hardware safety (not allowing to change the processor's frequency speed, aka overclocking the CPU) or, in some cases, for someone's profit (disabling wi-fi tethering is a typical one as users are forced to buy data plans in order to use their devices to tether). In Android's case, Superuser is composed of an app* and a set of instructions to give this app root rights.
The bootloader is a program which accesses the internal storage and, basically, controls the loading of the programs and data necessary to initiate the sequence of launching the OS (aka booting, thus the name bootloader). We say that a bootloader is locked when it is programmed in such a way that it won't allow to load the device if it detects data from third-party sources. Unlocked bootloaders do allow these data and will load what these data contain, which will be usually a modified version of the phone's firmware, known as "Custom ROM".
As we can see, there was the fear that one would need to have unlocked bootloaders (i.e the ability to load third-party data in the booting sequence) in order to gain root rights. This would have been terribly inconvenient because only a minority of users will have unlocked bootloaders, since the phones with unlocked bootloaders by default are the ones sold carrier-unlocked. Said carrier-free phones will be a minority as the phone is pretty expensive: most Xperia Plays will be sold using carrier subsidies.
However, our fellow member Chainfire found an exploit (a programming loophole) in Gingerbread which allows said app and instructions to be loaded without the need of touching the bootloaders. Basically, his Gingerbreak program allows the user to have root rights without loading any bootloader-sensitive data. This widens the possibilities for the majority of users who will buy this phone with a subsidy.
*edit 3* Later on, it has become possible to unlock the bootloader even for SIM-locked devices, thanks to different unlockers like Alejandrissimo and Jinx13. This means that, provided that you pay what they charge, you can have your device set up without the bothers of having to buy a SIM-free phone. What's better: their method of unlocking the bootloader SIM-unlocks the phone as well.
I think this is more or less a succint framework of ideas which allows us to define "root" and "unlocked bootloaders" properly. As they say, knowing is half the battle, so I hope this nugget of information allows users to deal with their phones with more confidence.
*edit* as of version 2.3.3, this information has changed. Gingerbreak doesn't work with 2.3.3 anymore, and it seems now that the only way to root with locked bootloaders is to flash a 2.3.2 rom with FlashTool and update through OTA.
*edit2* note that this explanations pertains mostly to the Xperia Play. Other devices are NAND-locked, which means for us that they need unlocked bootloaders to even get root access.
*Note that Android is built in such a way that every app is a user account with limited rights (the ones specified before you download it). Thus, Superuser is a user account as any other app and the set of instructions is meant to give this user account root rights.
Thank you! This was very helpful in clarifying some things.
"As we can see, there was the fear that one would need to have unlocked bootloaders (i.e the ability to load third-party data in the booting sequence) in order to gain root rights. This would have been terribly inconvenient because only a minority of users will have unlocked bootloaders, since the phones with unlocked bootloaders by default are the ones sold carrier-unlocked. Said carrier-free phones will be a minority as the phone is pretty expensive: most Xperia Plays will be sold using carrier subsidies"
by carrier unlocked do you mean sim unlocked? sorry 4 noob question
Indeed, that is what I mean.
Logseman said:
Indeed, that is what I mean.
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Alright, I asked this question and it was answered, but I want to make sure before I try anything.
I just found out from SE that my phone is the Rogers version. It's obviously been unlocked because I'm using it on AT&T.
What I don't know, though, is whether the bootloader is unlocked. Another member recommended that I check TrackID to see if it worked because it depends on the manufacturer DRM's that are wiped in unlocking the bootloader. It did work, so I assume it's still locked, but I wanted to confirm because of being carrier unlocked.
Sent from my R800a using XDA App
If TrackID works, your bootloader is locked, regardless of simlock.
I have a Sim-Unlocked Xperia Play from Rogers that I am using on ATT's network. My phone is boot-locked. When powered off, if I hold the search key while plugging in the USB cable, I do not get a blue light.
I was able to flash the firmware by holding the back key while plugging in the usb cable (with the phone off). I get a green light when I do this. Using flashtool, I was able get 2.3.3 rooted by loading the 2.3.2 firmware, rooting, and then updating OTA.
I bricked my phone several times while loading the firmware and each time I was able to fix it with flashtool or Sony Ericsson's Upgrade Utility. I found that you need a good USB cable, and even then it failed sometimes. I just kept trying and eventually it worked.
We wanted to provide an update on HTC’s progress with bringing bootloader unlocking to our newest phones. We know how excited some of you are for this capability, and we’ve put significant resources behind making this change as soon as possible. While we wish we could flip a simple switch and unlock all bootloaders across our device portfolio, this is actually a complex challenge that requires a new software build and extensive testing to deliver the best possible customer experience.
We’re thrilled to announce today that software updates to support bootloader unlocking will begin rolling out in August for the global HTC Sensation, followed by the HTC Sensation 4G on T-Mobile USA and the HTC EVO 3D on Sprint. We’re in the testing phase for the unlocking capability now, and we expect it to be fully operational by early September for devices that have received the software updates. We'll continue rolling out the unlocking capability over time to other devices as part of maintenance releases and new shipments.
HTC continues its commitment to unlocking bootloaders and supporting the developer community. Because of the importance of this community to us, please expect an update on this about every few weeks as we make progress toward launch. Thank you for your patience and continued support!
(they claim it will come to only two devices for starters the EVO 3D and the Sensation 4G and then it will slowly rollout to other devices that already have 2.3 or enough internal memory on them, this will all start in last August an early September for the first two droids listed... and others will soon follow suit, the only question is do you want you bootloader to come unlocked stock? Or will you buy it locked and be able to sit around and wait for your device to get an update to do so?? LOL
thats why my phone couldnt flash back to 2.3.2..(?)
I live in singapore.. phones are not carrier specific.. so does that mean my BL was unlocked even before I used gingerbreak?
I know this doesnt pertain to the play per se, but maybe you should add that, with nand locked devices, an unlocked bootloader is required to acheive full root, just incase someone with another device googles this question and ends up here
pros and cons of unlocked bootloader
Pros/Cons of rooting WITHOUT unlocking bootloader?
Since being interested in rooting my N1 I've been googling a lot but it's still somewhat confusing. One of the things that's making me hesitent is the idea of permanently (as of the date of this post) unlocking the phone and thus clearly/visibly voiding the warranty.
I've recently stumbled upon instructions for rooting without unlocking the bootloader? Am I correct in assuming this would make the phone appear (no unlock icon) to be unmodified? Also, does this mean one could fully reverse the rooting process and go back to fully stock google signed roms with OTA updates etc (essentially reverting it back as if it were never modified)?
It would seem this would be preferable to any method involving the unlocking of the bootloader. Are there any disadvantages of this? Any increased risks by NOT unlocking the bootloader? Is there a reason why most people have gone the rout of unlocking the bootloader?
My plan is simply to have root access to run setcpu on the stock FRF91 rom. As of now, I'm not interested in other ROMs (baby steps).
tommyinhi27 said:
Pros/Cons of rooting WITHOUT unlocking bootloader?
Since being interested in rooting my N1 I've been googling a lot but it's still somewhat confusing. One of the things that's making me hesitent is the idea of permanently (as of the date of this post) unlocking the phone and thus clearly/visibly voiding the warranty.
I've recently stumbled upon instructions for rooting without unlocking the bootloader? Am I correct in assuming this would make the phone appear (no unlock icon) to be unmodified? Also, does this mean one could fully reverse the rooting process and go back to fully stock google signed roms with OTA updates etc (essentially reverting it back as if it were never modified)?
It would seem this would be preferable to any method involving the unlocking of the bootloader. Are there any disadvantages of this? Any increased risks by NOT unlocking the bootloader? Is there a reason why most people have gone the rout of unlocking the bootloader?
My plan is simply to have root access to run setcpu on the stock FRF91 rom. As of now, I'm not interested in other ROMs (baby steps).
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The N1 is made by HTC, generaly with htc devices, flashing a stock rom, will re-lock the bootloader, If you decide just to root, you will need a custom kernel before you can O/C All that unlocking the bootloader does is 2 things, It will security unlock the nand (on nand locked devices) allowing r/w access to read only partitions, and it allows you to issue fastboot commands to your device, the main reason alot of play owners went down the unlocking the bootloader path, is that atm it is the only way to flash custom roms other devices, have found sneaky ways to push a custom recovery without unlocking bootloaders, and thus do not need one to flash a custom rom
AndroHero said:
I know this doesnt pertain to the play per se, but maybe you should add that, with nand locked devices, an unlocked bootloader is required to acheive full root, just incase someone with another device googles this question and ends up here
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Click to collapse
I'm not too knowledgeable about the whole Nand thing, so I think you could give a much better explanation about it. I'll include it then
whoa whoa whoa!!!! i achieved root on 2.3.3 with no prob using superoneclick v2.3.3. it works beautifully!
Yes, but you're replying to a thread that's 8 months out of date too!
Sent from my R800x using XDA
Lol. I know, but I've been trolling the site, and I think it may need a bit of new info so someone doesn't follow the steps here now that a better method has been found.
Sent from my R800at using XDA
isavegas said:
Lol. I know, but I've been trolling the site, and I think it may need a bit of new info so someone doesn't follow the steps here now that a better method has been found.
Sent from my R800at using XDA
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why not just stop bumping heavily old threads? then they can rest in piece
and nobody would care
the information thatit's outdated is alreada given in 1st post.
u also could ask a mod to close this as its outdated...
Hey, this thread may be outdated, but it's not my fault if someone necros old threads. Just let it die.
question
can i flash custom roms in a locked bootloader?
yes
big txmer said:
can i flash custom roms in a locked bootloader?
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Click to collapse
only stock gb ones nothing else
Hi guys, again here.. I read quite a lot about unlocking bootloader and I already know that it is re-lockable but once unlocked the DRM is gone. My question is just about the DRM...
- This DRM is specific for Sony Ericsson apps, like Track-ID, or will I have problem with other apps I bought from Market?
- Will I still be able to buy apps from Market?
- Does someone know which applications, despite Track-ID, I will lose?
Thank you guys!
OBS: Just one more question I see a lot of threads with Arc (LT15) firmwares with the title "arc/arc S". Can I flash a LT15 fw on a LT18? Like cyanogen, they just have a fw for LT15.. Can I? Thanks
The sony apps are really not important, anyway there are no features lost if you unlock your phone with setool, even OTA updates will work after unlocked.
And yes roms from arc or arc s are compatible
Sent from my Galaxy Note using xda premium
Alright,lets have a head count on how many users are able to unlock their bootloader and those who cant..
This would help our developers what rom to make..is it for stock or custom..
I for one expect that there are alot of users who uses custom kernel..but as time passes by,people also buy new phones and leave the x8 forum for good..
And now,more and more people are still buying new x8s..and we know that those people cant unlock their bootloader..
so if you can lock your bootlaoder because you have manufacture date of 11w26 below, vote yes
or
you cant unlock your bootloader because your manufacture date is 11w26+
the point of this thread is to know how many are using stock kernel because they cant unlock their bootloader and how many are using custom kernel because they can lock their bootloader..
i understand that their are a lot of people who can unlock their bootloader..
but as of now, more and more people are buying new x8s,tried unlocking their bootloaders and end up hard bricking their device..
i really notice that the x8 forum has two FACTIONS...
a faction of people who uses custom kernels and people who uses stock..
YES, we are divided...
Hello guys,
Like some many peoples i bought last month a xperia sp in a airtime provider. But I view that we can't have Cyanogen-Mod with a bootloader locked . In somes Samsung models we can have CM with just a root. Can developpers do something for have a CM rom with bootloader locked ?
Sorry for my bad english
Thanks
No
Any custom ROM not based on stock need a custom kernel,and for install a custom kernel need unlocked bootloader.So cm for lb is impossible.
Dammer Martins said:
Any custom ROM not based on stock need a custom kernel,and for install a custom kernel need unlocked bootloader.So cm for lb is impossible.
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Yes i know but I request developpers for unlock bootloaders unofficial or for can install custom rom without unlock bootloader.
This is not possible due to the security of the bootloader of Sony. I have absolute 0 knowledge about this but i think that the bootloader prevent not-properly-signed kernels..
mrjraider said:
This is not possible due to the security of the bootloader of Sony. I have absolute 0 knowledge about this but i think that the bootloader prevent not-properly-signed kernels..
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Click to collapse
In effect, indirectly it prevent for this.
Jermin94, to install CM, it need a specific kernel, to overclock/underclock per example, but it's for drivers i think too.
If even a locked bootloader CM version will be release, i think you will not got all of features of CM, but it meant be possible : i don't know.
Sorry for my bad english, i'm french
make a TA backup of your phone, including DRM keys before you unlock the bootloader. later on for warranty purposes you can relock the bootloader, and restore the DRM keys and stock firmware etc. i don't know how far the guys at the service center will go to detect whether the phone has been unlocked or not...
alphaz1 said:
make a TA backup of your phone, including DRM keys before you unlock the bootloader. later on for warranty purposes you can relock the bootloader, and restore the DRM keys and stock firmware etc. i don't know how far the guys at the service center will go to detect whether the phone has been unlocked or not...
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Click to collapse
alphaz1, That's no good to the OP as his phone is SIM locked to a carrier. That means it will have 'Bootloader Unlock Allowed: NO' in the Service Menu. There is currently no way to change this even if you SIM unlock at a later date (officially or otherwise).
Unless Bootloader Unlock Allowed is set to YES, you cannot enter Fastboot mode (Vol+ and Blue led) to enable entry of the Sony bootloader unlock code. Hence the the only custom ROMs that can be used are those based on the stock kernel - so no CM or MIUI etc.
Moral of the story: if you want to experiment with non-stock kernels and ROMs on an Xperia device, make sure you by a factory unlocked version, not one that is SIM locked or has been subsequently unlocked to allow use of other networks.
alphaz1 said:
make a TA backup of your phone, including DRM keys before you unlock the bootloader. later on for warranty purposes you can relock the bootloader, and restore the DRM keys and stock firmware etc. i don't know how far the guys at the service center will go to detect whether the phone has been unlocked or not...
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Click to collapse
As i know for unlock bootloader you need to enter IMEI for get unlock code.. So I think, once you enter that IMEI, sony add it to database. And your RMA depend on your luck
Only my theory.
Sent from my C5303 using xda app-developers app
Jermin94 said:
Hello guys,
Like some many peoples i bought last month a xperia sp in a airtime provider. But I view that we can't have Cyanogen-Mod with a bootloader locked . In somes Samsung models we can have CM with just a root. Can developpers do something for have a CM rom with bootloader locked ?
Sorry for my bad english
Thanks
Click to expand...
Click to collapse
You talk like the developers have a choice and are doing it on purpose.
SunnyChrono6 said:
You talk like the developers have a choice and are doing it on purpose.
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Click to collapse
I didn't understand what do you mean !
Jermin94 said:
I didn't understand what do you mean !
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Click to collapse
He means if it could have been done, it would have been done.
And because it can't be done, you asking isn't going to make any difference, no matter how much you plead
And this thread has no actual purpose. CM 10.2 might be possible when Sony will release 4.3, but it's not a certain thing.
Thread closed.
As the title says, It seems the bureaucrats at EE UK network are using phones that cannot be bootloader unlocked, even if Sony do allow, albeit with some loss of features.
Considering I flashed a generic rom, and my important photos/whatsapp files got wiped (I forgot to backup) as it was stated with flashtool only account based user data will get wiped not data from internal memory/sd card, well that didn't work.
I needed to root to allow some recovery software get my photos/whatsapp files back.
Now finding that the booloader is unlockable . I just want to throw the phone at the kunts at EE management. " EE the UK's biggest and fastest growing, bunch of dicks!"
Is their anybody else on EE who's bootloader is unlockable?
I'm so depressed with this all.
You needed to root to recover deleted files that you deleted by rooting?
davestuarts said:
As the title says, It seems the bureaucrats at EE UK network are using phones that cannot be bootloader unlocked, even if Sony do allow, albeit with some loss of features.
Considering I flashed a generic rom, and my important photos/whatsapp files got wiped (I forgot to backup) as it was stated with flashtool only account based user data will get wiped not data from internal memory/sd card, well that didn't work.
I needed to root to allow some recovery software get my photos/whatsapp files back.
Now finding that the booloader is unlockable . I just want to throw the phone at the kunts at EE management. " EE the UK's biggest and fastest growing, bunch of dicks!"
Is their anybody else on EE who's bootloader is unlockable?
I'm so depressed with this all.
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Click to collapse
In Poland Orange locks bootloaders for good in SONY devices, as I know there are tricks to make it unlockable, but not sure if possible to do it at home.
adamk7 said:
You needed to root to recover deleted files that you deleted by rooting?
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Click to collapse
I have not rooted yet, have only applied a generic less bloated rom. But now I need to root, so I can use software like 'hexamob recovery' which needs root to access the internal memory.
Tbh, the photo's I took that got wiped are sentimentally so important, hence me getting so stressed about it.
rollesky said:
In Poland Orange locks bootloaders for good in SONY devices, as I know there are tricks to make it unlockable, but not sure if possible to do it at home.
Click to expand...
Click to collapse
Oh, so orange there do the same. Here its now T-mobile/orange joined together as EE.
There must be a way to change that Bootloader state to yes. I know Orange/EE won't do it. Many people have asked in their forums about similar devices.
Thx for the insight tho...
I'll be totally honest with you here & you wont like the answer...
...if it says "bootloader unlock allowed: no" it will most probably stay that way.
My last Sony phone was from O2 & it was the same story.
The history of Sony phones with that state have stayed that way, as far as I'm aware
This means, once (optimistic) we get root you will only be able to flash stock based roms
Considering rooting newer versions of android seem to be getting more difficult, finding a way to bypass the bootloader is going to be near impossible...never say never but don't hold your breath.
The only Sony phone I had where the bootloader got unlocked unofficially was the X10 mini pro (beast phone) & that is when they were still Sony Ericsson & over 2 years after release (luckily back then you could flash CM / AOSP etc with locked bootloader, not any more though!)
Best bet is, give the phone back & buy it from a reseller like Clove / Handtec if unlocking the bootloader is that important to you & its not a contract deal you're after (or get sim only contract or something...PAYG FTW)
Otherwise, remember this for next time...
davestuarts said:
I have not rooted yet, have only applied a generic less bloated rom. But now I need to root, so I can use software like 'hexamob recovery' which needs root to access the internal memory.
Tbh, the photo's I took that got wiped are sentimentally so important, hence me getting so stressed about it.
Oh, so orange there do the same. Here its now T-mobile/orange joined together as EE.
There must be a way to change that Bootloader state to yes. I know Orange/EE won't do it. Many people have asked in their forums about similar devices.
Thx for the insight tho...
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Click to collapse
phroenix said:
I'll be totally honest with you here & you wont like the answer...
...if it says "bootloader unlock allowed: no" it will most probably stay that way.
My last Sony phone was from O2 & it was the same story.
The history of Sony phones with that state have stayed that way, as far as I'm aware
This means, once (optimistic) we get root you will only be able to flash stock based roms
Considering rooting newer versions of android seem to be getting more difficult, finding a way to bypass the bootloader is going to be near impossible...never say never but don't hold your breath.
The only Sony phone I had where the bootloader got unlocked unofficially was the X10 mini pro (beast phone) & that is when they were still Sony Ericsson & over 2 years after release (luckily back then you could flash CM / AOSP etc with locked bootloader, not any more though!)
..
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Click to collapse
What phroenix said is true.
From Xperia T (2012) onwards, there's no chance to get the bootloader unlocked if you read "bootloader unlock allowed: no".
@davestuarts Your old customization was 1289-4465 (T-mobile/EE) so I'm making a new FTF for you with that old firmware, let's try this way
istux said:
What phroenix said is true.
From Xperia T (2012) onwards, there's no chance to get the bootloader unlocked if you read "bootloader unlock allowed: no".
Sony, will they ever learn. I'm glad I didn't get rid of my viper running One X yet.
Tbh, the Sony layer on kitkit is pretty good considering and I'm plenty happy keeping stock roms, My main things are to run exposed and xprivacy.
@davestuarts Your old customization was 1289-4465 (T-mobile/EE) so I'm making a new FTF for you with that old firmware, let's try this way
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Click to collapse
Thanks istux, appreciate the help and less stress feeling.
Tha