All Region Samsung Smartphone Bootloader Relock 2019 Products

How to Relock Bootloader of 2019-made Samsung Smartphones of All Regions?

Unlocking and Relocking Bootloader is considered among two important topics in repairing Android devices (smartphones and tablets) in a way that if a device's Bootloader is not unlocked, using custom binary features such as Rooting, writing Stock ROM, Custom Recovery, and even processes such as removing FRP and screen lock, repairing IMEI, fixing serial number and … and all the features offered by Software Boxes will not be possible!!!

Relocking Bootloader is bringing Bootloader back to factory state. In this article, I want to show you how to relock all international AND China region devices which were produced in 2019 and later. Models such as Samsung Galaxy A30, galaxy A50, galaxy A70 and …. As you might know, Samsung has changed the relock method of their 2019 devices.

Before unlocking Bootloader, I recommend you read this:

• Relocking will not get your warranty back because your Knox is already tripped to 0*1.

• This method may not work on some models but it does not hurt to try! By relocking your device using the instructions in this article, your data will be wiped. So, it's better to get a backup of personal/user data and store it on your PC or laptop.

• I recommend you to, first, read this article fully then, start relocking.

• In case your device is flashed with Custom ROM, Custom Kernel, Root and … FRP lock would be enabled after relocking Bootloader and Custom binary might get blocked by FRP. So, I recommend you to first, flash your device with Official or Stock ROM.

• After relocking Bootloader, RMM State Lock will be enabled again. But it would be disabled by unlocking again. So, there is no need to worry.

• If password, pin, pattern or finger print lock is enabled, please disable them. Meaning, set lock screen on "No Lock Screen":

Menu → Settings → Lock screen and Security → Screen lock type → Swipe

It's time to start Bootloader Relocking process:

1. When you (as in the picture above) go to "Developer Options" in the Settings of your device, (Menu → Settings → Developer Options → OEM unlocking) you'll see that "OEM Unlocking" is disabled. Right under that, you'll see that "Bootloader is already unlocked". This means that you cannot relock Bootloader like before by disabling (swiping OFF) "OEM Unlocking" option. So, to relock the Bootloader follow the instruction.

2. Turn OFF your device and press volume Up + volume Down button at the same time (in some devices you need to press Bixby button instead of volume Up button) and connect your device to computer/laptop using USB cable so that it will enter Download Mode. Download Mode would be shown like picture 1 below. In this stage you need to press volume Up longer until stages on pictures 2 and 3 appears on the screen, then release the buttons. Afterwards, press volume up once, this time to relock the Bootloader. Your device will restart automatically and it will reset to factory state.

3. The device will boot up in a few minutes and it'll be relocked! Now, if you go to "Developer Options" in the Settings, you'll see that "OEM Unlock" is enabled and right under that you'll see that unlocking Bootloader is enabled:

Notice: when trying to enter Download Mode, if you face "Custom VBMETA: No Sign Info" (like the picture below), it means that currently, your device is flashed with Custom Binary. So, in order to relock your device you need to flash official or Stock ROM on your smartphone/tablet.

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