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What is ENG ROOT ?

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(@adamlawler)
Posts: 28
Eminent Member
Topic starter
 

Could someone explain to me what is ENG Root ? Is this abbreviation from engineering root ?

Is this possible to safety root unlocked but default encrypted Samsung device with Android 7 or 8 without wiping user data just by having eng root file for specific model ?

 
Posted : 24/01/2019 8:26 pm
passcodeunlock
(@passcodeunlock)
Posts: 792
Prominent Member
 

Yes.

Android 7 is easier to deal with, Android 8 is a pain. It is still possible to do it, but not with some click-click-done method )

 
Posted : 24/01/2019 9:35 pm
(@adamlawler)
Posts: 28
Eminent Member
Topic starter
 

Hmmm… roll

Here is for example ENG root files for g935f and g930f with Android 8.0

http//forum.gsmhosting.com/vbb/f453/free-all-eng-root-g935f-g930f-8-0-a-2437356/

So can I safety root this models by flash this files by AP button in Odin ?

 
Posted : 24/01/2019 9:55 pm
passcodeunlock
(@passcodeunlock)
Posts: 792
Prominent Member
 

It should work, but first get a dummy device and test it ?! )

I know people who rendered their userdata partition void because of making mistakes, eng root is not for people who just try things, but more for let's say advanced users.

 
Posted : 24/01/2019 11:19 pm
(@adamlawler)
Posts: 28
Eminent Member
Topic starter
 

But what mistakes could be done if I have correct file for specific model and I flash this using AP in ODIN without checking any other options. roll

From what I see here
https://easy-firmware.com/finder.php?qseo=home/browse/category/id/7391/
There are eng root files for specific models. So I assume this should work no matter what version of firmware model has ?

 
Posted : 25/01/2019 10:50 am
passcodeunlock
(@passcodeunlock)
Posts: 792
Prominent Member
 

Many, for example build number mismatch, Android patch level introducing new type of protection, 3rd party security apps by the user - which you can never know.

Starting the device in normal mode after flashing an eng root is always a risk to loose the encryption keys, this is why I wrote earlier to use a dummy device to test everything, then if all goes fine, do the live task.

 
Posted : 25/01/2019 10:58 am
(@adamlawler)
Posts: 28
Eminent Member
Topic starter
 

Ok so this is not forensically sound method to root the device I guess.

So eng root files should have the info about specific model and his firmware version (build)

 
Posted : 25/01/2019 4:13 pm
(@arcaine2)
Posts: 235
Estimable Member
 

Ok so this is not forensically sound method to root the device I guess.

So eng root files should have the info about specific model and his firmware version (build)

Depend on how you view it. Rooting the phone in any way can tamper with data. Eng root or engineering root is just a kernel image (boot), with root access and unauthorized ADB enabled, signed by Samsung so you can flash it with OEM and FRP lock. From my experience, the worst case scenario phone won't fully boot (bootloop) if it doesn't match firmware inside the phone. You can't flash 7.0 kernel on 8.0 device and vice versa. Sometimes an older eng root image works, sometimes, if there were some significant changes done in the newer versions, it doesn't. Restoring stock boot from matching firmware restores the phone to working state. I'm yet to see it wiping the phone.

 
Posted : 25/01/2019 6:00 pm
(@adamlawler)
Posts: 28
Eminent Member
Topic starter
 

Thanks for explanation.

One more question )
If it is necessary to flash ENG root which is matching to firmware version inside the phone why there is no info about firmware version on the site like this https://easy-firmware.com/finder.php?qseo=home/browse/category/id/7391/. For example there is only this "G955U_ENG_ROOT_7.0.rar".

 
Posted : 28/01/2019 7:46 pm
(@arcaine2)
Posts: 235
Estimable Member
 

If it is necessary to flash ENG root which is matching to firmware version inside the phone why there is no info about firmware version on the site like this https://easy-firmware.com/finder.php?qseo=home/browse/category/id/7391/. For example there is only this "G955U_ENG_ROOT_7.0.rar".

I can only assume that nobody checked or and named archive correctly. If you unpack this boot.img you'll that this is FA70_G955USQU1AQD8, so that's binary 1. It would only work with binary 1 phone in the first place. G955U switched to binary 2 in October 2017, even for 7.0 based firmware so this one wouldn't flash anyway on binary 2 phone.

On the other hand, i assume you saw that file on easy-firmware.com. I checked what's inside SM-G955F_ENG_ROOT.rar. When you unpack it, it's 7.0 which is not mentioned in file name, then G955FXXU1AQCC - so this could possibly work on all 7.0 released for G955F as all of them were binary 1. If you look closely you'll also notice "ro.build.display.id=ChoiMobile.VN.Root.G955FXXU1AQCC", and ChoiMobile seems to be some Vietnamese forum, unlikely to have valid keys to sign the image. There seems to be SuperSU added, no insecure adb enabled etc, so file is likely fake and won't flash on FRP and OEM locked device.

 
Posted : 29/01/2019 9:37 pm
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