[Guide] unlock T510 bootloader

[mingkee]

Disclaimer: your tablet warranty will void. Proceed with your own risk
Warning: your personal data, except on external SD card or USB drive, will be wiped during the process!
Prerequisite:
Host PC installed Samsung Smart Switch
USB C cable
Your tablet battery should be 70% or higher and you have done data backup
OEM Unlock enabled
1. About tablet
2. Software version
3. Hit Build Number few times
4. Enable USB Debugging
5. Allow your host computer
6. If you don't see OEM Unlocking, wait for 7 days or do the following trick
https://www.xda-developers.com/fix-...y-s9-samsung-galaxy-s8-samsung-galaxy-note-8/
Are you ready? Let's do it.
1. Turn your tablet off and disconnect USB cable
2. Press and hold both volume up and down buttons and connect to host computer
3. You should see factory reset screen, but this time you should see one more option. Press and hold volume up to unlock the bootloader.
4. If you see a warning screen on boot, the bootloader is unlocked.

Currently I am still finding how to make patched boot and post update later how to root.

 

[Magendanz]

John Wu, the developer of Magisk, already has an excellent guide for rooting the Samsung Exynos devices here: https://topjohnwu.github.io/Magisk/samsung

(Just ignore references to the Bixby button.)

 

[mingkee]

John Wu, the developer of Magisk, already has an excellent guide for rooting the Samsung Exynos devices here: https://topjohnwu.github.io/Magisk/samsung

(Just ignore references to the Bixby button.)

The only issue is to find right boot. I couldn't find from sammobile

 

[mingkee]

John Wu, the developer of Magisk, already has an excellent guide for rooting the Samsung Exynos devices here: https://topjohnwu.github.io/Magisk/samsung

(Just ignore references to the Bixby button.)

I followed his guide except there's no bixby button but something goes wrong.
Even KNOX tripped, I don't see root no matter how I try.
***** update *****
This time I started all over and patched AP with Magisk provided in the link and this time it worked.
Press and hold both power and volume buttons to turn it on. Release both buttons when the screen flashes briefly (it bypasses bootloader warning) and you will enter system with Magisk.

 

[Kenaz Rune]

Unlocking with Linux?

This thread is the only one I see that describes how to unlock the T510. Unfortunately it requires the Samsung migration tool (why?) and it doesn't exist on Linux. I've tried hooking up Heimdall 1.4.2, but I only see the download mode screen. I can either flash something or restart. I got the PIT from the device now, but I don't see a way to unlock the bootloader. Can it be done with Linux?

Well, I decided to go verify the OEM unlock switch (which I ticked yesterday successfully), and it was unset. I just re-set it, and I have the unlock option. I don't need to have the migration tool on my computer, thankfully.

 

[MossyTC]

@milsabords From the Nexus Stock ROM thread -

So far I have not succeeded unlocking the boot loader.
Dumb question %-( : instructions say to press Volume Up AND Volume Down. There is only ONE Vomume button wth three positions, Idle, Up and Down. How can I mash Up and Down at the same time ?
Should I do it power-on or power-off, with or without USB cable connected to my PC ?

There are no dumb questions! Only dumb people asking dumb ... wait that doesn't sound right ...

Anyway - the Up and Down parts of the volume button can be pressed at the same time. You can see this if you first press the Up part, and while keeping the Up part pressed you can then also press the Down part.

Do this while the device is off, USB cable not connected, then connect the USB cable.

Thanks, it did not work, tablet in power off state would not get alive pressing either Vol keys..
Shoud I mash the power button while pressing the Volume Up, then the Volume Down buttons ?

It should work with only the Volume and Volume down buttons held down when the USB cable is connected from the computer.

Did not work.
On the powered offed screen while connected to the PC I see a 100% level in the middle and yellow triangle with an USB picture at the bottom.
Pressing either Vol key does nothing.
In an earlier post you advised not to connect ???

Note: I have a 2016 Tab A, running RR Pie. Never had this kind of problem with it.

What I actually said earlier was that you should be holding down the volume buttons when you connect.

To be clear, and as per the OP -

1. DIsconnect the cable
2. Hold down the Volume buttons and keep them held down until after the next step
3. Connect the USB cable from the tablet to the computer (which should be on at this point)
4. You should see the factory reset screen

 

[lewmur]

@milsabords From the Nexus Stock ROM thread -
/
What I actually said earlier was that you should be holding down the volume buttons when you connect.

To be clear, and as per the OP -

1. DIsconnect the cable
2. Hold down the Volume buttons and keep them held down until after the next step
3. Connect the USB cable from the tablet to the computer (which should be on at this point)
4. You should see the factory reset screen

I'm not sure @milsabords understands that the vol button is NOT a "rocker switch", where you press one end or the other, but TWO switches where you CAN press both ends at the same time and, while holding both ends down, you plug in the USB cable. There is no need to press the power button. A green screen will appear and then you release both buttons and follow the on screen instructions.
edit: And, BTW, you didn't have this problem with the T58x because its bootloader was never locked.

 

[milsabords]

@MossyTC and @lewmur
Thanks a lot for your patience. It worked.

 

[TheGreyGoose]

Tab A T510 USA

I have the variant from best buy just purchased it today. I did the date&time trick and the Unlock Bootloader option doesn't appear. I'm not sure how to proceed its a USA one does that matter?

 

[elliwigy]

I have the variant from best buy just purchased it today. I did the date&time trick and the Unlock Bootloader option doesn't appear. I'm not sure how to proceed its a USA one does that matter?

i bought a T510 from best buy about a month ago and took me a whole 2 minutes to unlock and get twrp and root

i hope u didnt buy a carrier model that cant be unlocked lol

 

[thex2]

Another prerequisite, at least for me anyways, is to update the operating system on the tablet first. I bought my tablet brand new and tried to unlock the bootloader. The Smart Switch software did not recognize my tablet when I go to the unlock bootloader screen, so it wouldn't do it. I had to boot back into the OS and update to Android 9. After that, Smart Switch worked and the bootloader unlocked by following the directions in OPs post.

 

[redhonker]

Hi,

I've followed instruction and got the unlocked warning on reboot. The device appears to be unlocked.

Odin failed to flash TWRP with the device showing "Only official released binaries are allowed to be flashed (BOOT)" in red.

I went into developer option, there is no longer an entry for OEM unlocking.

I then did the time trick and reboot the device. Not sure if this step matter. But after that the option showed up greyed out, saying the bootloader is already unlocked.

All good now

 

[lewmur]

Ist ist possible to relock the the device later? For example with the ADB command that the warning will be away?

ADB isn't needed. You use the same procedure to relock it as you did to unlock. When you do that, the option will be to lock rather than unlock.

 

[fritz.barnes]

PC doesn't see device

When I follow this procedure, I do get to the right screen on the tablet, but my PC does not see the tablet at all.

Same thing happens with download mode. It only works if I enter download mode by ADB command.

 

[elliwigy]

When I follow this procedure, I do get to the right screen on the tablet, but my PC does not see the tablet at all.

Same thing happens with download mode. It only works if I enter download mode by ADB command.

sounds like a pc issue

 

[lewmur]

When I follow this procedure, I do get to the right screen on the tablet, but my PC does not see the tablet at all.

Same thing happens with download mode. It only works if I enter download mode by ADB command.

When you follow what proceedure? The correct proceedure doesn't require the PC to "see" the tablet. Plugging the cable into a PC is ONLY to bring up the unlock screen on the tablet. You can't do it by plugging into a charger because the tablet won't get the correct response on the data lines. But once you get the right screen on the tablet, you can unplug the cable and still proceed with the unlock routine.
edit: I think the only reason Samsung came up with this routine is that there isn't a physical Home button to press and they want to make sure the combination of buttons won't be pushed "accidentally". They WANT it to be very difficult to unlock.

 

[Wigwam0]

Sm-t510

i bought a T510 from best buy about a month ago and took me a whole 2 minutes to unlock and get twrp and root

i hope u didnt buy a carrier model that cant be unlocked lol

Iam trying to root the samsung sm-t510 2019 model. I have set the developer optie to unlock, but iam still getting the bootloader is locked....why...

 

[lewmur]

Iam trying to root the samsung sm-t510 2019 model. I have set the developer optie to unlock, but iam still getting the bootloader is locked....why...

Have you actually read the instructions? The OEM enable and the bootloader lock are two entirely different things. Until the latest models, Samsung tablets didn't have locked bootloaders unless they were "carrier" models. Now, in addition to enabling OEM in developer mode, you also need to unlock the bootloader prior to using Odin. I'm not going to list the instructions again because they are already posted.

 

[winstonwlau]

Is there a way to check if bootloader is unlocked?

 

[lewmur]

Is there a way to check if bootloader is unlocked?

When you turn the tablet on, you will see a warning screen telling you that the tablet is in danger if the bootloader is unlocked.