Page Comparison

First enable the Developer Options menu by going into Settings / About phone, and tapping the build number 7 times. If it doesn't work, you can search "enable developer options" with your phone model on internet.
Then go into Settings / Developer Options, and enable USB debugging.

1. Connect to the Wi-Fi network

...

1. Bluetooth : Off

...

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1. NFC : Off

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1. Settings / Display :

   • Brightness level : 0 %

   • Adaptive brightness : Off

...

1. • Sleep :

...

1. • after 30m

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1. • Screen rotation : Off

...

1. • (Portrait)

2. Settings / Sound : Disable all sounds

3. Settings / System / Gestures : Disable Quick launch Camera

4. Disable notifications

5. Disable Google Assistant (Ok Google)

6. Settings / Battery :

   • Power saving mode : Off

   • Ultra Power saving mode : Off

   • App power saving / detail : Off

...

1. Settings / Security :

   • Screen

...

1. • Lock : None

   • Location : Off

2. Settings / Security / Unknown sources : On

3. Chrome : Close Chrome. Go on settings / app / Chrome and clear all data on storage. On Welcome page, uncheck the 'help make chrome better ...' and click on 'Accept & continue' button.  Then Turn off sync if a gmail account is detected. Then kill Chrome and reopen it and click on 'No, thanks' on Browse faster popup.

4. Chrome Settings / Home Page : Off

5. Other Security settings

   • Security policy update

     • Automatic update : Off

     • Wifi only : Off

6. Send security reports : Off

7. Usage data access

   • Google Play Services

     • Allow usage tracking : Off

   • Google Play Store

     • Allow usage tracking : Off

   • Smart Manager

     • Allow usage tracking : Off

8. Google Play (skip if no Google account is configured)
   - Notifications : Off
   - Auto Update apps : Off
   - Update Google services (otherwise the update popup will show up)