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[Exynos] How to Unlock the Bootloader

Hi Guys!
The S7 ( Exynos 8890 variant ) is my first Samsung Device and while it works really well I'm just not sure on how to Unlock the Bootloader. With my previous Sony Devices you can just visit Sony's website and get done with it but after asking some friends they told me to just enable the OEM Unlock button. Is enabling gonna let me flash custom ROMs / recoveries and custom kernels? They also told me to be careful about flashing custom bootloaders (?)
If someone can just kindly explain on what this is or how will I unlock the bootloader it would be really appreciated
Thanks alot!!

Revontheus said:
Hi Guys!
The S7 ( Exynos 8890 variant ) is my first Samsung Device and while it works really well I'm just not sure on how to Unlock the Bootloader. With my previous Sony Devices you can just visit Sony's website and get done with it but after asking some friends they told me to just enable the OEM Unlock button. Is enabling gonna let me flash custom ROMs / recoveries and custom kernels? They also told me to be careful about flashing custom bootloaders (?)
If someone can just kindly explain on what this is or how will I unlock the bootloader it would be really appreciated
Thanks alot!!
Click to expand...
Click to collapse
Hi Mate
To OEM unlock is very easy on the exynos models . only the Qualcomm ( US variant) is kind of tricky in our model is allow to do it with the click of a button , you have to:
Go to Settings / About device / Software info / Tap 7 times on Build number to enable Developer
Once developer options are enable ( you will see it under Settings) enter there you will see the option OEM Enable, if you are planing to root or flash any custom rom or recovery you need to enable it , flashing with out enabling this option is risky
Flashing is always risky but if you follow the instructions should no be a problem

MAX 404 said:
Hi Mate
To OEM unlock is very easy on the exynos models . only the Qualcomm ( US variant) is kind of tricky in our model is allow to do it with the click of a button , you have to:
Go to Settings / About device / Software info / Tap 7 times on Build number to enable Developer
Once developer options are enable ( you will see it under Settings) enter there you will see the option OEM Enable, if you are planing to root or flash any custom rom or recovery you need to enable it , flashing with out enabling this option is risky
Flashing is always risky but if you follow the instructions should no be a problem
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Click to collapse
That's it? No more bootloader to unlock? Or is it because the exynos variants come with unlocked bootloaders thanks

Revontheus said:
That's it? No more bootloader to unlock? Or is it because the exynos variants come with unlocked bootloaders thanks
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Click to collapse
That is it mate..........exynos variants they have the unlock option

Isnt there the knox varranty flag, too? As it was there on earlier devices, it should be present on s7.
Root with 0x0 would be nice, but impossible, or? My s5 is not root friendly and I dont wanna lose my 0x0 state... So our S7 has also this behaviour of triggering the knox flag, I guess.
Bad times for having root on sammies phones...
Gesendet von meinem SM-G900F mit Tapatalk

Sorry to resurrect a dead thread, but I'm having a weird issue. So, I got my S7 a few days ago used, and discovered that the previous owner had already tripped Knox so I figured I might as well root to have all the various benefits. Well, I got a bit too impatient and rushed through the procedure I was reading, so I ended up rooting without changing the OEM Unlock option in Developer Options. Root was still successful and I have SuperSU installed and a few other root apps installed, all working fine. But once I realized I hadn't enabled OEM Unlock, I figured I would just go back into settings and change it.....except it's not there. The option is simply gone from Developer Options, even though I KNOW I saw it in there sometime before rooting.
Can anyone help me? I want to flash TWRP but I'm afraid to do so without having checked that option, and I don't understand why it disappeared from the menu!

Guys,
A quick question. Did anyone try flashing AOSP based roms on this device? I do a research before purchasing it. I love Lineage OS and wondering if this Exynos model works well with it.

dego_ said:
Guys,
A quick question. Did anyone try flashing AOSP based roms on this device? I do a research before purchasing it. I love Lineage OS and wondering if this Exynos model works well with it.
Click to expand...
Click to collapse
Quick answer:
Imho it does NOT work well.
Severe BT bugs.

OEM Unlock Greyed out
My OEM unlock setting under developers options is greyed out. I think it might be because of the motherboard replacement i got. Anyway to fix it?

ay0503 said:
My OEM unlock setting under developers options is greyed out. I think it might be because of the motherboard replacement i got. Anyway to fix it?
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Click to collapse
My dad's S7 edge had this issue when I was trying to flash lineage OS on it for him. I re-flashed the original firmware (Had a HK version but phone was repaired once in the US) and using odin and that fixed it for him at least. Not sure if it was a different firmware issue or just some bug.

How to root Cricket Wireless Alcatel Idol 4?

Hello! I've been searching the net far and wide for a way to root my Alcatel idol 4. Its the cricket model. I was able to unlock the boot loader and turn on USB debugging but besides that I haven't had any luck rooting my device.
Has anyone tried and has success or know any methods that could work?
Thank you!

jinxxie said:
Hello! I've been searching the net far and wide for a way to root my Alcatel idol 4. Its the cricket model. I was able to unlock the boot loader and turn on USB debugging but besides that I haven't had any luck rooting my device.
Has anyone tried and has success or know any methods that could work?
Thank you!
Click to expand...
Click to collapse
How did you unlock the bootloader? I'm not able to do it. Fastboot doesn't see the phone when I boot to bootloader.

Chief_Nodnarb said:
How did you unlock the bootloader? I'm not able to do it. Fastboot doesn't see the phone when I boot to bootloader.
Click to expand...
Click to collapse
It's in the developer options called "OEM unlocking" 5th option down from the top.

apb91781 said:
It's in the developer options called "OEM unlocking" 5th option down from the top.
Click to expand...
Click to collapse
That's been done since I got the phone. Still doesn't make a difference, fast boot commands have been stripped from this phone.

Chief_Nodnarb said:
That's been done since I got the phone. Still doesn't make a difference, fast boot commands have been stripped from this phone.
Click to expand...
Click to collapse
try this SETTINGS>BACKUP AND RESET>DEVICE RESET. this will restore all settings to default state while keeping dev-ops and all apps and data

Sorry if I'm speaking out of turn, as I'm not highly experienced...>BUT, I went thru what your referring to with my OnePlus phone. The option in the developer options that says "OEM Unlocking" for bootloader is nothing more than an option in the Android system that allows the bootloader to be unlocked should the mfg allow it. Whether this is on/off makes no difference for this being unlocked. It just has to be turned on for the unlocking to work. I had this Idol 4 for a short time but returned it due to the fastboot commands being removed.

SM-S205DL (Straight Talk Model)

Hi all,
I have a Straight Talk Galaxy A20, model SM-S205DL. Will root instructions work for this model? I don't notice an OEM unlock option in the Developer Mode menu, but I can boot in download mode. Thoughts? It's been a while since I tried to install custom firmware.

justlance said:
Hi all,
I have a Straight Talk Galaxy A20, model SM-S205DL. Will root instructions work for this model? I don't notice an OEM unlock option in the Developer Mode menu, but I can boot in download mode. Thoughts? It's been a while since I tried to install custom firmware.
Click to expand...
Click to collapse
You need to unlock OEM for it to work

physwizz said:
You need to unlock OEM for it to work
Click to expand...
Click to collapse
Okay. Is there a way to do that other than the developer options menu? If the OEM unlock option isn't there, is there some other method?

justlance said:
Okay. Is there a way to do that other than the developer options menu? If the OEM unlock option isn't there, is there some other method?
Click to expand...
Click to collapse
There is a trick where you change the date to some weeks in the future.

im having the same issue

yea the dev options to show OEM Unlock seems to be gone from Straighttalk/tracfone versions, its even Gone from Download Mode (you dont even SEE the option for long-press vol+ to unlock bootloader)

is there a way to root

Corelua01 said:
is there a way to root
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Click to collapse
Some places claim to be able to change the CID of the phone. Would that help? I imagine once able to load different non-TFN BS firmware on the phone that magic developer option may appear. Or is it a hardware thing and the exynos chip has something to do with it? Not sure how it all works yet. Anyone know what the unlocked us retail model contains?
I'm not smart enough to find out so hopefully someone is and reads this and can chime in regarding all the points...
Me and my arrow...

Question Is the SM-A125U different?

Is my A12 (a125u) different and unable to be bl unlocked/rooted, etc? It has OEM unlock in dev options....?

Did you figure this out? Looking to do the same... Also can't find a firmware for it, please share what you did if you had success. Thanks!

robles4242 said:
Is my A12 (a125u) different and unable to be bl unlocked/rooted, etc? It has OEM unlock in dev options..?
Click to expand...
Click to collapse
Yes, the A125U has OEM UNLOCK in the developer options......you can turn that ON by going into : settings > about phone > software information ...and then tap BUILD NUMBER several times until you see that you have enabled "developer options". Then you go into developer options and turn on OEM UNLOCKING.
Before updating firmware recently OEM UNLOCKING was greyed out. But now I can switch it on. Now the question is, can this variant be properly bootloader unlocked and rooted. The known repository for downloadable firmwares for Samsung phones DOES NOT seem to have this variant firmware for download. And I wonder if that is required for this to be properly rooted.

Galaxy firmware has the firmware for this variant. I have the att version and I can't seem to unlock the bootloader. Holding volume up in the download screen does nothing. Any luck?

Bump, I have all same questions.... Anyone figure anything out?

Before I had tmo Sim unlock my phone the I set the oen unlock to unlock now its not there at all

Anybody rooted this yet ?

anyone know the interchangeability of the firmware between the a125u and other versions

I wish to know as well

What if the OEM unlock not showing how do you get it to show

fabrizioluraghi said:
anyone know the interchangeability of the firmware between the a125u and other versions
Click to expand...
Click to collapse
I'd like to know this too. I believe the internal are all the same for the MediaTek devices. I got a SM-A125F for free and want to use it in the US. It looks like I could if I can convert it to SM-A125U or MS-A125M. I already bricked it once trying to flash U firmware and has to flash back to F
Will Samsung Galaxy A12 work in USA?
In this page we are going to show you the compatibility of Samsung Galaxy A12 with the mobile networks of USA and with the telephony operators that provide service in USA.
www.kimovil.com

i was able to root this sm-a125u very easily... downloaded A125WVLS3AUL1 firmware (canadian unlocked) flash the full stock rom and was able to unlock bootloader as simple as holding down all buttons when going into download mode, it unlocked it that way and was able to flash twrp, magisk and its all good

I have a similar issue but vice versa. I bought a US version (SM-A125U1) only to find out months after that the dual sim option is locked and i think the only way to unlock it is changing the firmware. Now I need help to know what I can do to, please.

exnfox said:
i was able to root this sm-a125u very easily... downloaded A125WVLS3AUL1 firmware (canadian unlocked) flash the full stock rom and was able to unlock bootloader as simple as holding down all buttons when going into download mode, it unlocked it that way and was able to flash twrp, magisk and its all good
Click to expand...
Click to collapse
Thanks for the info.
-Was there an "OEM UNLOCK" option in the Developer's Options?
-What did you do in DOWNLOAD mode to unlock?

sirrooke said:
Thanks for the info.
-Was there an "OEM UNLOCK" option in the Developer's Options?
-What did you do in DOWNLOAD mode to unlock?
Click to expand...
Click to collapse
Yes it was in the developer settings to oem unlock... then download said volume up continue. voilume up long press device unlock mode, volume down cancel

a125u bit 4 can i flash W version ? with out any issue ?

ghostthegod1 said:
Anybody rooted this yet ?
Click to expand...
Click to collapse
Yes, back long ago, there is a thread in this forum for U3 devices only.
sahelkhan022 said:
a125u bit 4 can i flash W version ? with out any issue ?
Click to expand...
Click to collapse
only bit 3.

i already flash u4 w version , very easy

Oem blocked

Hey everyone,
I wanted to turn on OEM unlocking but it's greyed out please help me, I wanted to install TWRP but i 'cant because of this problem. Device name - Lenovo 4 10 tab
Android version - 8.1.0 please help me .

Welcome to XDA Enjoy.
If it's grey out it's locked...

blackhawk said:
Welcome to XDA Enjoy.
If it's grey out it's locked...
Click to expand...
Click to collapse
So..... Any way to fix it ?

Mysticqwerty said:
So..... Any way to fix it ?
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Click to collapse
Not that I know of.
Someone here might have a plan though.
Try posting in that device's section for better results.

Is there any way to download custom recovery without oem unlocking ?

Mysticqwerty said:
Is there any way to download custom recovery without oem unlocking ?
Click to expand...
Click to collapse
Again I don't think so but I don't play with anything other than stock Android configurations... yet.

Mysticqwerty said:
Hey everyone,
I wanted to turn on OEM unlocking but it's greyed out please help me, I wanted to install TWRP but i 'cant because of this problem. Device name - Lenovo 4 10 tab
Android version - 8.1.0 please help me .
Click to expand...
Click to collapse
Look inside here:
OEM unlock option is greyed out, How enable it ?
I have recently purchased a Pixel 4 XL, in order to root it I have enabled USB debugging however the option of OEM unlock is greyed out, that means I won't be able to unlock the bootloader. I want to root my phone in order to install Substratum...
forum.xda-developers.com