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[Q] JTAG and getting rid of 4.3

Hello I was wondering if I could be pointed in the right direction. I was recently cursed with Samsung's knox crap because I didn't start messing with rooting until after the 4.3 update. Knox clicked and I am forever sick with 4.3. Except, I recently got a hold of a spare jtag connector from a friend. It is not a riff box it is an msp430-jtag connector. Would there be anyway way to hook this to my computer and write over 4.3 with an unlocked 4.3? Would I lose download mode or anything? I found a video of some guy decompiling 4.3 stock from a mini s4 and if you simply delete aboot.img sm1 sm2 and sm3 it fully gets rid of Knox. That is my goal with the jtag. Is there any software I can use that will read the storage? Well a jtag work in the first place or did Samsung find a way to prevent that too. Thanks!!!

bobbyofna said:
Hello I was wondering if I could be pointed in the right direction. I was recently cursed with Samsung's knox crap because I didn't start messing with rooting until after the 4.3 update. Knox clicked and I am forever sick with 4.3. Except, I recently got a hold of a spare jtag connector from a friend. It is not a riff box it is an msp430-jtag connector. Would there be anyway way to hook this to my computer and write over 4.3 with an unlocked 4.3? Would I lose download mode or anything? I found a video of some guy decompiling 4.3 stock from a mini s4 and if you simply delete aboot.img sm1 sm2 and sm3 it fully gets rid of Knox. That is my goal with the jtag. Is there any software I can use that will read the storage? Well a jtag work in the first place or did Samsung find a way to prevent that too. Thanks!!!
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That could work on anything other than our phone model. Tampering with the bootchain at all will cause an instant hardbrick because of the locked bootloader. We have the only variant with a locked bootloader on 4.3.
We have no such thing as an unlocked 4.3 bootchain, but if you had one your idea would work perfectly. You just overwrite the original chain and it'll boot, but flashing anything currently available with a riff box except the vrucml1 bootchain will hardbrick the device.
Sent from my SCH-I535 using Tapatalk 2

To add it is not Knox that locked the bootloader. It is Qualcom code that burnt the Q-fuse on the processor making it non rewritable through that particular fuse. Only way to unlock from my understanding would be to be able to route through another fuse as there are like 4 of them. This enables Samsung to modify the bootloader a limited amount of times.

I'm still wondering if we could boot with the insecure boot loader if we "bricked" the 4.3 one then boot from sd with the insecure one. Does the debrick image hold all of the boot chain or is it just the part that seems to be easily bricked? Sure if that could work we would be dependent on the sd card but that wouldn't matter for a lot of people. I have another related question that someone might be able to answer. Is it possible to use the debrick image on a thumb drive connected with a otg cable?

ThePagel said:
I'm still wondering if we could boot with the insecure boot loader if we "bricked" the 4.3 one then boot from sd with the insecure one. Does the debrick image hold all of the boot chain or is it just the part that seems to be easily bricked? Sure if that could work we would be dependent on the sd card but that wouldn't matter for a lot of people. I have another related question that someone might be able to answer. Is it possible to use the debrick image on a thumb drive connected with a otg cable?
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Click to collapse
The debrick image doesn't have a bootchain. It's just a stock system image that the bootchain verifies and force boots into.
The bootchain is still present through the regular mechanism through the system checks (ie: fuses, chips) and knows it's booting a correct system image, you can't force a bootchain through an external SD card.
Sent from my SCH-I535 using Tapatalk 2

Taking it to verizon?
BadUsername said:
That could work on anything other than our phone model. Tampering with the bootchain at all will cause an instant hardbrick because of the locked bootloader. We have the only variant with a locked bootloader on 4.3.
We have no such thing as an unlocked 4.3 bootchain, but if you had one your idea would work perfectly. You just overwrite the original chain and it'll boot, but flashing anything currently available with a riff box except the vrucml1 bootchain will hardbrick the device.
Sent from my SCH-I535 using Tapatalk 2
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Click to collapse
youtube.com/watch?v=75DKAGNstbM
I did not mean using a bootchain I know it'll brick it I have made that mistake before and it is possible to come back from it by the way. If you watch this video he takes the current 4.3 rom and removes knox and the bootloader and reflashes it. Of course he was able to do this because he didn't trip knox in the first place which I have. But my goal with the JTAG would be to write over the memory bypassing the processor and flash a deknoxed 4.3 from there. Also I just found out that apparently some law went through which requires your carrier to unlock the bootloader for you if you take it to them and ask. Does anybody know of this? It would make sense that it says please take your phone to an authorized verizon dealer when the bootloader stops you. If that is true and I take my phone to them, would there be a way to record everything they are flashing onto my phone without hiding a usb sniffer so that we can figure out how to unlock this crap? Thanks.

bobbyofna said:
youtube.com/watch?v=75DKAGNstbM
I did not mean using a bootchain I know it'll brick it I have made that mistake before and it is possible to come back from it by the way. If you watch this video he takes the current 4.3 rom and removes knox and the bootloader and reflashes it. Of course he was able to do this because he didn't trip knox in the first place which I have. But my goal with the JTAG would be to write over the memory bypassing the processor and flash a deknoxed 4.3 from there. Also I just found out that apparently some law went through which requires your carrier to unlock the bootloader for you if you take it to them and ask. Does anybody know of this? It would make sense that it says please take your phone to an authorized verizon dealer when the bootloader stops you. If that is true and I take my phone to them, would there be a way to record everything they are flashing onto my phone without hiding a usb sniffer so that we can figure out how to unlock this crap? Thanks.
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Click to collapse
That law is for the sim unlock and 99% of Verizon store employees and customer service reps will have no idea how to help you with any problem.

ThePagel said:
That law is for the sim unlock and 99% of Verizon store employees and customer service reps will have no idea how to help you with any problem.
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Are sure? because I found someone on the forums last night who said he went to verizon and they unlocked his bootloader. let me dig for it. I am definitely going to verizon tomorrow and trying for myself.

ThePagel said:
That law is for the sim unlock and 99% of Verizon store employees and customer service reps will have no idea how to help you with any problem.
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Click to collapse
http://forum.xda-developers.com/showthread.php?t=2683469
Here the guy talks about asking verizon about the bootloader.

bobbyofna said:
http://forum.xda-developers.com/showthread.php?t=2683469
Here the guy talks about asking verizon about the bootloader.
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Click to collapse
He asked over a phone call, he was never given an unlocked bootloader. And his information isn't correct.
They will have no idea what you're talking about in a store, but if you can get a hold of a unlocked bootloader, you should ask for an S4 one also then head over to their forum to collect the $5000 bounty.
Cut me a small chunk for pointing you in the right direction though. I'd be happy with $200 or so.
Trust me, they aren't required to give you anything to unlock your bootloader. They are only required to unlock the phone for global use following termination of a plan, and the phone is already unlocked to do that.
Sent from my SCH-I535 using Tapatalk 2

fuse
Prdog1 I also have knox how can I go about modifying the fuse?

DJBurner said:
Prdog1 I also have knox how can I go about modifying the fuse?
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Click to collapse
You won't be able to do this without hardware knowledge and complex programming understanding.
Highly experienced developers are working on this (maybe) , there's no documented method on hardware modification for that process.
Sent from my SCH-I535 using Tapatalk 2

Thanks
Thank you very much
BadUsername said:
You won't be able to do this without hardware knowledge and complex programming understanding.
Highly experienced developers are working on this (maybe) , there's no documented method on hardware modification for that process.
Sent from my SCH-I535 using Tapatalk 2
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Rooting voids warranty? yes?

I have purchased k900 recently and I want to root my mobile but I know it will void the warranty. So the question is how to avail the warranty? Do they really check whether the device is rooted or not? Can we just unroot the device and return back to the stock firmware and avail the warranty? I heard latest phones have some mechanism to detect whether the phone is rooted or not and even if we unroot the device they will still know that it was rooted at some point of time. Is it true?
I have already posted this thread in the lenovo k900 sub forum but realised that this question is more of a general sense.

Do anybody have something to say about it?

In some devices yes and in some no
supdup said:
I have purchased k900 recently and I want to root my mobile but I know it will void the warranty. So the question is how to avail the warranty? Do they really check whether the device is rooted or not? Can we just unroot the device and return back to the stock firmware and avail the warranty? I heard latest phones have some mechanism to detect whether the phone is rooted or not and even if we unroot the device they will still know that it was rooted at some point of time. Is it true?
I have already posted this thread in the lenovo k900 sub forum but realised that this question is more of a general sense.
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In some devices its true that they will come to know.. They come to know from the bootloader.
I m using HTC so i can tell you on that.. after rooting it shows unlocked in bootloader mode.. It can be locked again.. For that a RUU is needed which is stock rom..

From what I read the one who for sure do it is Samsung on the Note 3 (And I think other models but not sure which) they have what's called Knox 0x0 and when you root it it trips it to show Knox 0x1 and as of now I haven't seen a way to undo a tripped Knox but there are ways to root now without tripping Knox but I rooted my Note 3 and tripped Knox but don't really care Lol. But a tripped know will void warranty.

nexx2014 said:
From what I read the one who for sure do it is Samsung on the Note 3 (And I think other models but not sure which) they have what's called Knox 0x0 and when you root it it trips it to show Knox 0x1 and as of now I haven't seen a way to undo a tripped Knox but there are ways to root now without tripping Knox but I rooted my Note 3 and tripped Knox but don't really care Lol. But a tripped know will void warranty.
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Do you know whether trip knox is present in the lenovo devices, particularly in k900 model?

supdup said:
Do you know whether trip knox is present in the lenovo devices, particularly in k900 model?
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Click to collapse
I looked around really quick but i didnt see mention of the k900 having something similar to Samsungs Knox.

supdup said:
I have purchased k900 recently and I want to root my mobile but I know it will void the warranty. So the question is how to avail the warranty? Do they really check whether the device is rooted or not? Can we just unroot the device and return back to the stock firmware and avail the warranty? I heard latest phones have some mechanism to detect whether the phone is rooted or not and even if we unroot the device they will still know that it was rooted at some point of time. Is it true?
I have already posted this thread in the lenovo k900 sub forum but realised that this question is more of a general sense.
Click to expand...
Click to collapse
Yes, rooting your device can void warranty, but you would need to be very unlucky. In most cases when you return your device there may be a fault with it and you can simply relock your phone and reflash stock rom before returning device. In other caes you may have bricked your device, i.e. your device does not work at all. This has happened to me and others and when I returned it they never checked. As I said, you would have to be very unlucky for them to void your warranty.....but it is the risk you take

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supdup said:
I have purchased k900 recently and I want to root my mobile but I know it will void the warranty. So the question is how to avail the warranty? Do they really check whether the device is rooted or not? Can we just unroot the device and return back to the stock firmware and avail the warranty? I heard latest phones have some mechanism to detect whether the phone is rooted or not and even if we unroot the device they will still know that it was rooted at some point of time. Is it true?
I have already posted this thread in the lenovo k900 sub forum but realised that this question is more of a general sense.
Click to expand...
Click to collapse
My suggestion is: Just do it and forget about the possibility that you are going to need your warranty. On my own experience thinking about the warranty just makes Murphy's Law to come.

nexx2014 said:
I looked around really quick but i didnt see mention of the k900 having something similar to Samsungs Knox.
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Click to collapse
Thanks for looking arround. I guess knox is not present in my lenovo phone
Spartan Rises said:
Yes, rooting your device can void warranty, but you would need to be very unlucky. In most cases when you return your device there may be a fault with it and you can simply relock your phone and reflash stock rom before returning device. In other caes you may have bricked your device, i.e. your device does not work at all. This has happened to me and others and when I returned it they never checked. As I said, you would have to be very unlucky for them to void your warranty.....but it is the risk you take
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Thanks. I am currently searching the stock row rom of my mobile.
jpvillabona said:
My suggestion is: Just do it and forget about the possibility that you are going to need your warranty. On my own experience thinking about the warranty just makes Murphy's Law to come.
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lol, being a lawyer i would agree to that

Is it possible to unroot and revert to complete stock?

Hello,
I am leasing the Sprint S6 edge and when my lease is over, i will have to give the phone back to sprint. Anyways, my question is ..... should i not root this then? Is there a way to completely revert to stock and leave no trace that i rooted?
Thanks!

Yes

jkt97401 said:
Hello,
I am leasing the Sprint S6 edge and when my lease is over, i will have to give the phone back to sprint. Anyways, my question is ..... should i not root this then? Is there a way to completely revert to stock and leave no trace that i rooted?
Thanks!
Click to expand...
Click to collapse
You will also have the option to buyout the balance on the phone and keep it at the end of your lease.

jkt97401 said:
Hello,
I am leasing the Sprint S6 edge and when my lease is over, i will have to give the phone back to sprint. Anyways, my question is ..... should i not root this then? Is there a way to completely revert to stock and leave no trace that i rooted?
Thanks!
Click to expand...
Click to collapse
You can root via pinpong root and you won't trip knox. You'll only trip knox once you flash custom recovery.

jkt97401 said:
Hello,
I am leasing the Sprint S6 edge and when my lease is over, i will have to give the phone back to sprint. Anyways, my question is ..... should i not root this then? Is there a way to completely revert to stock and leave no trace that i rooted?
Thanks!
Click to expand...
Click to collapse
Knox will be tripped but Sprint doesn't check that anyway, as I've turned in about 3 Samsung devices with knox tripped in the past with no problems

Thank you guys. I'm the past has there been a way to reset knox? What exactly is knox? I have never owned a Samsung.
I'm a former HTC fanboy lol
Edit : I'm sure glad i researched what knox is! Someone give me the scoop, how do you Samsung flashaholics do it? Is it possible to flash a custom rom without tripping knox?

jkt97401 said:
Thank you guys. I'm the past has there been a way to reset knox? What exactly is knox? I have never owned a Samsung.
I'm a former HTC fanboy lol
Edit : I'm sure glad i researched what knox is! Someone give me the scoop, how do you Samsung flashaholics do it? Is it possible to flash a custom rom without tripping knox?
Click to expand...
Click to collapse
The whole knox thing is worse than it sounds. As @Soooperstar mentioned, Sprint may not really enforce it as some may think. Rooting has become much more prevalent these days. Sprint knows it. I hear lots of guys mention that they've turned in knox tripped devices without incident. As of today, you need a custom recovery in order to flash a rom. Come on in, the water's warm.

Branding removal

Will it and how will it be possible to remove the branding of any service right from the start without voiding any warranty? Sorry if this is still unknown or basically the same for every Android phone...

Not clear on what you're asking. Do you mean remove the boot logo and pre-installed apps for a particular carrier? Both of those will require you to flash a different ROM or parts of a ROM.

Averix said:
Not clear on what you're asking. Do you mean remove the boot logo and pre-installed apps for a particular carrier? Both of those will require you to flash a different ROM or parts of a ROM.
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Click to collapse
Yeah like in Germany installing a DBT on a phone shipped with ATO (which is quite a common situation in Germany). Are there any ways?

Not until more people get then in hands and we see if we can root and flash them.
The we will know

I am sorry to tell you although I was asking you but I found out that you seem to not be right. Several threads are about this subject (well not concerning S8+ but any other Samsung Galaxy) and if you flash another official ROM via Odin it (OF COURSE as they say) does not void your warranty and does not trip the KNOX counter. If you know anything else to pay attention to in this subject, well, feel free to enlighten me :good:

Mystixor said:
I am sorry to tell you although I was asking you but I found out that you seem to not be right. Several threads are about this subject (well not concerning S8+ but any other Samsung Galaxy) and if you flash another official ROM via Odin it (OF COURSE as they say) does not void your warranty and does not trip the KNOX counter. If you know anything else to pay attention to in this subject, well, feel free to enlighten me :good:
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That would be flashing a different ROM as I stated in the first answer...

Averix said:
That would be flashing a different ROM as I stated in the first answer...
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Click to collapse
Yes excuse me I wasn't referring to you but you do agree with me on the warranty not being voided?

Real Clarification on Samsung KNOX

I have read a lot about Samsung KNOX and how it is supposed to work, but the more I read the less I know how KNOX is tripped.
I understand what KNOX is, I know how it works and I know the supposed "reasons" it exists.
I also do know, that KNOX has changed a couple of times in the past years, which is perhaps the reason I find to much conflicting information on this topic.
So, since the A51 is quite a new phone, I want to know, how KNOX is tripped on the Galaxy A51.
Is unlocking the bootloader already enough?
Can you unlock the bootloader but flashing anything will make it trip?
What exactly is allowed with the newest KNOX and at which point does it exactly trip?
Can you not modify anything anymore, without tripping KNOX?

since Knox requires a separate login even after phone boots up i would guess it is not accessible with just a booted up and unlocked phone. last i read it created an additional "encrypted sandbox" on the already unlocked phone where data did not cross the sandbox barriers.

Aki-to said:
I have read a lot about Samsung KNOX and how it is supposed to work, but the more I read the less I know how KNOX is tripped.
I understand what KNOX is, I know how it works and I know the supposed "reasons" it exists.
I also do know, that KNOX has changed a couple of times in the past years, which is perhaps the reason I find to much conflicting information on this topic.
So, since the A51 is quite a new phone, I want to know, how KNOX is tripped on the Galaxy A51.
Is unlocking the bootloader already enough?
Can you unlock the bootloader but flashing anything will make it trip?
What exactly is allowed with the newest KNOX and at which point does it exactly trip?
Can you not modify anything anymore, without tripping KNOX?
Click to expand...
Click to collapse
Unolocking the bootloader isn't enough to trip Knox, it trips once you flash a modified file.
Like TWRP, a ROM, etc that doesn't have Samsung's signature of official software.