This guide is for Windows.

- Connect phone via USB to PC, wait a while for drivers to install.
- Install "Minimal ADB Fastboot" (from XDA-Developers).
- Enable USB DEBUG under "Config / Developer Options" on phone.
- Open a Command Prompt under the folder "C:\Program Files (x86)\Minimal ADB and Fastboot"
- Open phone adb shell: `adb shell`
- Use the following commands:


```
# to find packages:

pm list packages | grep soagent
pm list packages | grep wssyncmldm

# to disable packages (USE THESE):
pm disable-user --user 0 com.sec.android.soagent
pm disable-user --user 0 com.wssyncmldm

# to reenable later (IF YOU CHANGE YOUR MIND):
pm enable --user 0 com.sec.android.soagent
pm enable --user 0 com.wssyncmldm
```

[ref](https://forum.xda-developers.com/t/disable-system-update.4223781/#post-84367233)