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for educational purposes only :

Huawei P30 Pro remove Demo mode
Below are the tested steps to remove huawei P30 pro demo mode!100% safe
This should also work on all Huawei phones

1-Connect phone to wifi, Press and hold on the retail demo app and select then press retail setting and enter the pass 1122334455

2-Enable allow uninstall and enter the pass 00CDIAGE

3-Go to settings->security&privacy->more settings->device admin->deactivate retail demo app

4-Enable usb debugging and OEM unlock

5- Install quick shortcut maker on phone
...5.1- Search for retail demo and copy address to notepad on pc(ex:
com.huawei.retailmode)
...5.2- Search for p30 pro and copy address to notepad on pc (ex:
com.huawei.experience.vog.mea)

6- Download platform-tools-r28.0.2-windows to pc
Link: https://www.teamandroid.com/2017/05/06/download-adb-fastboot-android-sdk-platform-tools/

7-Open platform tools then press and hold SHIFT then right click and select open command windows

8-connect phone to pc and allow usb connection

9- In cmd type adb devices to check if connection is succesful

10- type:
.1-adb shell cmd package uninstall -k --user 0 com.huawei.retaildemo

.2-adb shell cmd package uninstall -k --user 0 com.huawei.experience.vog.mea

DONE