There is the way to disable One UI without root or bootloader unlock you need to: 1) Enable menu for programmers (go to info, tap build nr 7 times) 2) Enable USB debugging 3) connect your PC, download Android Studio or Android Toolkit to get adb (on Linux you can simply sudo apt install adb) 4) issue commands: adb shell 'pm disable-user --user 0 com.sec.android.gallery3d' //disable Samsung Gallery
adb shell 'pm disable-user --user 0 com.samsung.android.app.notes' //disable Notes app
adb shell 'pm disable-user --user 0 com.samsung.android.scloud' //disable Samsung Cloud
adb shell 'pm disable-user --user 0 com.samsung.android.knox.analytics.uploader' // disable surveillance
adb shell 'pm disable-user --user 0 com.microsoft.office.officehubrow' // disable MS Office apps ads
adb shell 'pm disable-user --user 0 com.sec.android.app.launcher' //probably our main target - OneUI
adb shell 'pm disable-user --user 0 com.samsung.android.smartswitchassistant' // smart switch assistant Issue command adb shell 'pm list packages -f' to get full list of the packages. That way I was able to disable One UI in favor of other launchers, disable bloatware apps, and my Task Switcher was returned to Vanilla Android one. Works much better and faster. Modifications are done as a setting for current user (not globally) so you'll not void your warranty that way. You can undo any of these by similar 'pm-enable' command or factory reset.
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