A short explanation about the protections FRP and OEM
FRP: Google has added a new protection for its Android system at the release of Lollipop and called the add-FRP, a shortcut to the FACTORY RESET PROTECTION so that this protection prevents the addition of anything modified to the Android operating system and has another function is the request of another Google account was logged on from the device Do a Wipe Data and Factory Reset.
OEM: Samsung has added new protection for its devices called OEM, a feature that is somewhat similar to Google's FRP protection so that it prevents you from using anything that has been modified on Android.
How to disable FRP and OEM
We go to the device settings, Then we go to about device.
Press seven consecutive options Build number You will then be shown developer options.
Return to Settings and open Developer Options You will see an option OEM Unlock Enable it.
If the OEM Unlock option disappears Read the following article: How to Fix Missing OEM Unlock Button
How to disable OEM (Bootloader) For Galaxy devices 2019Samsung's new Galaxy devices come with bootloader protection, So that it prevents modification to the operating system.
So that it is in download mode OEM:ON.
This protection can be easily disabled but the device will erase all files when you open the boot loader.
Back up your files and apps then follow us.
1-Turn off the device.
2-press Volume Down + Volume UP + Connect the USB cable.
3-You will see a warning and under it three options (Volume up: Continue / Volume up long press: Device unlock mode / Volume down: Cancel restart phone.
4-Will choose Volume up long press: Device unlock mode.
5-Unlock bootloader page will appear, Under it are two options (Volume up: Yes / Volume down: No).
6-Press the volume up key.
The device will reboot and a message will appear telling you that the boot loader has been unlocked, Then press the power switch to continue.
7-Then press the power switch to continue.
8-The bootloader is unlocked, Done.
Steps video explanation works on all Galaxy devices 2019