Remove Samsung Account from Galaxy Devices

It worked on Galaxy S9.

Disclaimer: if you have any data on the device its always recommended to do a backup before you do anything.

First of all, this doesn't work if:
  1. your device is locked with a Password/PIN/Biometrics and you're locked out.
  2. You're in the first setup and you can't access the system.
  3. You don't have a PC
If not, just follow these steps:
  1. Enable developer options (Settings -> About Phone/tablet -> Software information -> keep tapping on "Build number" until the messege says "you are now a developer")
  2. go to developer options and enable USB Debugging.
  3. Grab your PC and download SDK Platform Tools.
  4. extract the zip file, go to the folder where you extracted it and press shift, right click and click on "open powershell window here"
  5. connect your device to the PC via USB cable.
  6. type ./adb devices and press enter, your device should be listed.
  7. type ./adb shell and press enter and tap on "allow" on the prompt on your device.
  8. type pm uninstall -k --user 0 com.osp.app.signin and press enter
  9. Now the samsung account is removed from your device
  10. type pm install-existing com.osp.app.signin and press enter
  11. disconnect your device from the PC. And now you will see that the samsung account has been succesfully reset and you can add your account.
Reference:
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