[Realme X2 Pro Guides, News, & Discussion] Polarfuchs:
To enter the Engineering Mode:

dial *#899#

Here are two more lists with secret codes that I found, it seems without root yout can only execude codes with Level 1.

I am not responsible for any data loss or damage to your device by using these codes. Use at your own risk.

</engineer_switch>RMX1931L1:/etc $ cat sys_engineer_order_list.xml
cat sys_engineer_order_list.xml
<?xml version="1.0" encoding="utf-8"?>
<OrderList version="20190101" xmlns:android="http://schemas.android.com/apk/res/android">
<OrderItem name="*#0000#" type="startActivity" platform="ALL" region="CN" level="1">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.network.TelecomVersionInfo"
android:targetPackage="com.oppo.engineermode" />
</OrderItem>

<OrderItem name="*#12345#" type="startActivity" platform="ALL" region="ALL" level="2">
<intent
android:action="com.oppo.activation.action.STOP_SERVICE" />
</OrderItem>
<OrderItem name="*#10000#" type="startActivity" platform="ALL" region="ALL" level="2">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.MarkResultShow"
android:targetPackage="com.oppo.engineermode" />
</OrderItem>
<OrderItem name="*#36446337#" type="startActivity" platform="ALL" region="ALL" level="2">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.EngineeringMode"
android:targetPackage="com.oppo.engineermode" />
</OrderItem>
<OrderItem name="*##*37847#" type="startActivity" platform="ALL" region="ALL" level="6">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.device.DeviceListActivity"
android:targetPackage="com.oppo.engineermode" />
</OrderItem>
<OrderItem name="*#394321#" type="startService" platform="ALL" region="ALL" level="2">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.LanguageSwitchToZimbabweService"
android:targetPackage="com.oppo.engineermode" />
</OrderItem>
<OrderItem name="*#3644321#" type="startActivity" platform="MTK" region="ALL" level="2">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.RebootManager"
android:targetPackage="com.oppo.engineermode" />
</OrderItem>
<OrderItem name="*#3644999#" type="startActivity" platform="MTK" region="ALL" level="2">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.RebootManager"
android:targetPackage="com.oppo.engineermode" />
</OrderItem>
<OrderItem name="*#66#" type="startActivity" platform="ALL" region="ALL" level="1">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.IMeiAndPcbCheck"
android:targetPackage="com.oppo.engineermode" />
</OrderItem>
<OrderItem name="*#6776#" type="startActivity" platform="ALL" region="ALL" level="1">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.CheckSoftwareInfo"
android:targetPackage="com.oppo.engineermode" />
</OrderItem>
<OrderItem name="*#649010#" type="startActivity" platform="ALL" region="ALL" level="2">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.development.DiagEnabled"
android:targetPackage="com.oppo.engineermode" />
</OrderItem>
<OrderItem name="*#637243#" type="startActivity" platform="ALL" region="ALL" level="2">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.ShowRemoteMessage"
android:targetPackage="com.oppo.engineermode" />
</OrderItem>

<OrderItem name="*#727#" type="startActivity" platform="MTK" region="ALL" level="2">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.network.LteSarTest"
android:targetPackage="com.oppo.engineermode.network" />
</OrderItem>
<OrderItem name="*#727#" type="startActivity" platform="QCOM" region="ALL" level="2">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.network.SarTest"
android:targetPackage="com.oppo.engineermode.network" />
</OrderItem>
<OrderItem name="*#7327#" type="startActivity" platform="ALL" region="ALL" level="2">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.rftoolkit.RfToolkitCustomerService"
android:targetPackage="com.oppo.rftoolkit" />
</OrderItem>
<!-- Add for TW FETNET, bud 1278196-->
<OrderItem name="*#7890#" type="startActivity" platform="ALL" region="EXP" level="1">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.network.NetWorkSet"
android:targetPackage="com.oppo.engineermode.network" />
</OrderItem>
<OrderItem name="*#800#" type="startActivity" platform="MTK" region="ALL" level="1">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.mediatek.engineermode.EngineerMode"
android:targetPackage="com.mediatek.engineermode">
<extra
android:name="isRedirectToLogger"
android:value="true" />
</intent>
</OrderItem>
<OrderItem name="*#807#" type="startActivity" platform="ALL" region="ALL" level="2">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.aftersale.DeviceSimpleDetectActivity"
android:targetPackage="com.oppo.engineermode" />
</OrderItem>
<OrderItem name="*#808#" type="startActivity" platform="ALL" region="ALL" level="2">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.EngineerModeMain"
android:targetPackage="com.oppo.engineermode" />
</OrderItem>
<OrderItem name="*#805#" type="startActivity" platform="ALL" region="ALL" level="2">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.bluetoothtest.BluetoothTest"
android:targetPackage="com.oppo.engineermode" />
</OrderItem>
<OrderItem name="*#803#" type="startActivity" platform="ALL" region="ALL" level="2">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.wifitest.WifiSettings"
android:targetPackage="com.oppo.engineermode" />
</OrderItem>
<OrderItem name="*#804#" type="startActivity" platform="ALL" region="ALL" level="2">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.network.NetworkSearch"
android:targetPackage="com.oppo.engineermode.network" />
</OrderItem>
<OrderItem name="*#802#" type="startActivity" platform="ALL" region="ALL" level="2">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.gps.GpsActivity"
android:targetPackage="com.oppo.engineermode" />
</OrderItem>
<OrderItem name="*#806#" type="startActivity" platform="ALL" region="ALL" level="2">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.autoaging.AutoAgingMainListActivity"
android:targetPackage="com.oppo.engineermode" />
</OrderItem>
<OrderItem name="*#8778#" type="startActivity" platform="ALL" region="ALL" level="2">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.manualtest.MasterClear"
android:targetPackage="com.oppo.engineermode" />
</OrderItem>
<OrderItem name="*#888#" type="startActivity" platform="ALL" region="ALL" level="1">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.PcbShow"
android:targetPackage="com.oppo.engineermode" />
</OrderItem>
<OrderItem name="*##*8110#" type="startActivity" platform="ALL" region="ALL" level="2">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.development.OtaSwitch"
android:targetPackage="com.oppo.engineermode" />
</OrderItem>
<OrderItem name="*#872#" type="startActivity" platform="MTK" region="ALL" level="2">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.development.UsbPreloaderEnabled"
android:targetPackage="com.oppo.engineermode" />
</OrderItem>
<OrderItem name="*#8019#" type="startActivity" platform="ALL" region="ALL" level="2">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.wireless.WifiSocketHelper"
android:targetPackage="com.oppo.engineermode" />
</OrderItem>
<OrderItem name="*#818#" type="startActivity" platform="ALL" region="ALL" level="2">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.network.NetworkSearchNew"
android:targetPackage="com.oppo.engineermode.network">
<extra
android:name="Step_Num"
android:value="First" />
</intent>
</OrderItem>
<OrderItem name="*#838#" type="startActivity" platform="ALL" region="ALL" level="2">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.network.NetworkSearchNew"
android:targetPackage="com.oppo.engineermode.network">
<extra
android:name="Step_Num"
android:value="Second" />
</intent>
</OrderItem>
<OrderItem name="*#858#" type="startActivity" platform="QCOM" region="ALL" level="2">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.network.NetworkSearchNew"
android:targetPackage="com.oppo.engineermode.network">
<extra
android:name="Step_Num"
android:value="Third" />
</intent>
</OrderItem>
<OrderItem name="*#878#" type="startActivity" platform="QCOM" region="ALL" level="2">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.network.NetworkSearchNew"
android:targetPackage="com.oppo.engineermode.network">
<extra
android:name="Step_Num"
android:value="Fourth" />
</intent>
</OrderItem>
<OrderItem name="*#8168#" type="startActivity" platform="ALL" region="CN" level="2">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.network.CmccEvaluationOTA"
android:targetPackage="com.oppo.engineermode.network">
<extra
android:name="AntPosition"
android:value="Button" />
</intent>
</OrderItem>
<OrderItem name="*#8398#" type="startActivity" platform="ALL" region="CN" level="2">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.network.CmccEvaluationOTA"
android:targetPackage="com.oppo.engineermode.network">
<extra
android:name="AntPosition"
android:value="TOP" />
</intent>
</OrderItem>
<OrderItem name="*#8020#" type="startActivity" platform="ALL" region="ALL" level="2">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.wireless.WifiAdbHelper"
android:targetPackage="com.oppo.engineermode" />
</OrderItem>
<OrderItem name="*#899#" type="other" platform="ALL" region="ALL" level="1">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.aftersale.AfterSalePage"
android:targetPackage="com.oppo.engineermode" />
</OrderItem>

<OrderItem name="*#99#" type="startActivity" platform="ALL" region="ALL" level="2">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.development.KeepSrceenOn"
android:targetPackage="com.oppo.engineermode" />
</OrderItem>
<OrderItem name="*#928#" type="startActivity" platform="MTK" region="ALL" level="2">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.wireless.SwitchMetaModeHelper"
android:targetPackage="com.oppo.engineermode" />
</OrderItem>
<OrderItem name="*#928#" type="startActivity" platform="QCOM" region="ALL" level="2">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.wifitest.WifiFTMActivity"
android:targetPackage="com.oppo.engineermode">
<extra
android:name="Step_WifiFtm"
android:value="First" />
</intent>
</OrderItem>
<OrderItem name="*#9434#" type="startActivity" platform="ALL" region="ALL" level="1">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.decrypt.WifiDecryptionActivity"
android:targetPackage="com.oppo.decrypt" />
</OrderItem>
<OrderItem name="*#911#" type="startActivity" platform="ALL" region="ALL" level="2">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.PowerOff"
android:targetPackage="com.oppo.engineermode" />
</OrderItem>
<OrderItem name="*#391#" type="other" platform="ALL" region="EXP" level="2">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.network.SwitchSoftwareVersion"
android:targetPackage="com.oppo.engineermode.network" />
</OrderItem>
<OrderItem name="*#3954391#" type="other" platform="ALL" region="EXP" level="2" />
<OrderItem name="*#7799#" type="other" platform="ALL" region="EXP" level="2" />
<OrderItem name="*#789#" type="startActivity" platform="ALL" region="EXP" level="1">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.network.simlockexp.ClearTelcelnetlock"
android:targetPackage="com.oppo.engineermode.network" />
</OrderItem>
<OrderItem name="*#912#" type="startActivity" platform="ALL" region="EXP" level="1">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.network.simlockexp.RecoverTelcelnetlock"
android:targetPackage="com.oppo.engineermode.network" />
</OrderItem>
<OrderItem name="*#3921234#" type="other" platform="ALL" region="EXP" level="1">
<intent android:action="com.android.engineeringmode.SwitchSoftwareVersionInFw" />
</OrderItem>
<OrderItem name="*#39243#" type="startActivity" platform="ALL" region="EXP" level="1">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.network.explock.SecretVersonShowActivityExp"
android:targetPackage="com.oppo.engineermode.network" />
</OrderItem>

<OrderItem name="*#3988691#" type="startActivity" platform="ALL" region="EXP" level="1">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.network.explock.RegionNetLockDialogExp"
android:targetPackage="com.oppo.engineermode.network" />
</OrderItem>

<OrderItem name="*#390000#" type="sendBroadcast" platform="ALL" region="EXP" level="2">
<intent
android:action="com.oppo.show.all.language"
android:targetClass="com.oppo.settings.exp.ExpBroadcastReceiver"
android:targetPackage="com.android.settings" />
</OrderItem>
<OrderItem name="*#07#" type="other" platform="ALL" region="EXP" level="1" />
<OrderItem name="*#67767#" type="other" platform="ALL" region="EXP" level="1" />
<OrderItem name="*#8011#" type="other" platform="ALL" region="ALL" level="1" />
<OrderItem name="*#39724#" type="other" platform="ALL" region="EXP" level="2" />
<OrderItem name="*#390501#" type="other" platform="ALL" region="EXP" level="1" />
<OrderItem name="*#390502#" type="other" platform="ALL" region="EXP" level="1" />
<OrderItem name="*#667611#" type="other" platform="ALL" region="ALL" level="2" />
<OrderItem name="*#667610#" type="other" platform="ALL" region="ALL" level="2" />
<!-- Xiang.Gui Add for 5G test switch *#54794824#-->
<OrderItem name="*#54794824#" type="other" platform="ALL" region="ALL" level="1" />

<OrderItem name="*#39137#" type="startService" platform="ALL" region="EXP" level="2">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.network.SwitchSoftwareService"
android:targetPackage="com.oppo.engineermode.network">
<extra
android:name="carrierval"
android:value="@string/carrierVersion_thailand_true" />
<extra
android:name="carriername"
android:value="Thailand TRUE" />
<extra
android:name="sim_switch_operator"
android:value="@string/sim_switch_operator_switch_on" />
</intent>
</OrderItem>

<OrderItem name="*#39248#" type="startService" platform="ALL" region="EXP" level="2">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.network.SwitchSoftwareService"
android:targetPackage="com.oppo.engineermode.network">
<extra
android:name="carrierval"
android:value="@string/carrierVersion_thailand_ais" />
<extra
android:name="carriername"
android:value="Thailand AIS" />
<extra
android:name="sim_switch_operator"
android:value="@string/sim_switch_operator_switch_on" />
</intent>
</OrderItem>

<OrderItem name="*#39369#" type="startService" platform="ALL" region="EXP" level="2">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.network.SwitchSoftwareService"
android:targetPackage="com.oppo.engineermode.network">
<extra
android:name="carrierval"
android:value="@string/carrierVersion_thailand_dtac" />
<extra
android:name="carriername"
android:value="Thailand DTAC" />
<extra
android:name="sim_switch_operator"
android:value="@string/sim_switch_operator_switch_on" />
</intent>
</OrderItem>

<OrderItem name="*#008#" type="startActivity" platform="ALL" region="ALL" level="2">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.LanguageSwitchActivity"
android:targetPackage="com.oppo.engineermode">
<extra
android:name="language_str"
android:value="zh_CN" />
</intent>
</OrderItem>
<OrderItem name="*#7869264#" type="startActivity" platform="ALL" region="EXP" level="1">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.network.explock.DeviceLockDialogExp"
android:targetPackage="com.oppo.engineermode.network">
</intent>
</OrderItem>
<!-- SH add start-->
<OrderItem name="*#643223#" type="startActivity" platform="ALL" region="ALL" level="1">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.development.DevelopmentConfigPage"
android:targetPackage="com.oppo.engineermode">
</intent>
</OrderItem>

<OrderItem name="*#885526#" type="startActivity" platform="ALL" region="ALL" level="2">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.development.VulkanDebugActivity"
android:targetPackage="com.oppo.engineermode">
</intent>
</OrderItem>
<!-- SH add end-->

<OrderItem name="*#456225#" type="startActivity" platform="ALL" region="EXP" level="2">
<intent
android:action="android.intent.action.MAIN"
android:targetClass="com.oppo.engineermode.aftersale.SwitchRegionAssistant"
android:targetPackage="com.oppo.engineermode">
</intent>
</OrderItem>
</OrderList>
RMX1931L1:/etc $

RMX1931L1:/etc $ cat sys_engineer_config_list.xml
cat sys_engineer_config_list.xml
<?xml version="1.0" encoding="UTF-8"?>
<engineer_switch>
<version>20190101</version>
<switch switchName="activity_sw" switchState="false" />
<switch switchName="service_sw" switchState="false" />
<switch switchName="shell_command_sw" switchState="false" />
<switch switchName="engineer_order_sw" switchState="false" />
<switch switchName="reset_atm_sw" switchState="false" />
<switch switchName="key_status_dcs" switchState="true" />
<switch switchName="google_key_fix" switchState="true" />
<!--*#928#-->
<activity packageName="com.oppo.engineermode"
className="com.oppo.engineermode.wifitest.WifiFTMActivity" />
<!--*#3644321#,*#3644999#-->
<activity packageName="com.oppo.engineermode" className="com.oppo.engineermode.RebootManager" />
<!--*#8019#-->
<activity packageName="com.oppo.engineermode"
className="com.oppo.engineermode.wireless.WifiSocketHelper" />
<!--*#8020#-->
<activity packageName="com.oppo.engineermode"
className="com.oppo.engineermode.wireless.WifiAdbHelper" />
<activity packageName="com.oppo.engineermode"
className="com.oppo.engineermode.wireless.SwitchMetaModeHelper" />
<activity packageName="com.oppo.engineermode"
className="com.oppo.engineermode.DetectMasterClearResult" />
<!--*#637243#-->
<activity packageName="com.oppo.engineermode"
className="com.oppo.engineermode.ShowRemoteMessage" />
<activity packageName="com.oppo.engineermode"
className="com.oppo.engineermode.manualtest.modeltest.ModelTestImpl" />
<service packageName="com.oppo.engineermode"
className="com.oppo.engineermode.assistant.SwitchWifiMMI" />
<service packageName="com.oppo.engineermode"
className="com.oppo.engineermode.assistant.SwitchProductionMode" />
<service packageName="com.oppo.engineermode"
className="com.oppo.autotest.connector.AutoTestServer" />
<service packageName="com.oppo.engineermode" className="com.oppo.autotest.RunAllTest" />
<service packageName="com.oppo.engineermode"
className="com.oppo.engineermode.wireless.WifiAdbHelperService" />
<shell_command command="--update_back_cover_color" />
<shell_command command="--update_engineer_result" />
<shell_command command="--update_oppo_sn" />
<shell_command command="--reset_back_cover_color" />
<shell_command command="--reset_write_protect" />
<shell_command command="--reset_engineer_result" />
<shell_command command="--reset_download_mode" />
<shell_command command="--execute_start_mmi" />
<shell_command command="--execute_stop_mmi" />
<shell_command command="--execute_master_clear" />
<shell_command command="--execute_power_off" />
<shell_command command="--execute_model_test" />
<shell_command command="--execute_engineer_order" />
<shell_command command="--execute_switch_production_mode" />
<shell_command command="--execute_detect_ms_result" />
<shell_command command="--execute_show_production_message" />
<shell_command command="--execute_switch_wifi_mmi" />
<shell_command command="--execute_launch_wifi_mmi" />
<shell_command command="--generate_attk_key_pair" />
<shell_command command="--verify_attk_key_pair" />
<shell_command command="--verify_attk_key_pair_only" />
<shell_command command="--verify_ali_key" />
<shell_command command="--export_attk_public_key" />
<shell_command command="--get_device_id" />
<shell_command command="--enable_rpmb" />
<shell_command command="--crypto_eng_verify" />
<shell_command command="--get_tee_version" />
<shell_command command="--install_keybox" />
<shell_command command="--provision_keybox" />
<shell_command command="--verify_keybox" />
<engineer_order order="*#8011#" />
<engineer_order order="*#8019#" />
<engineer_order order="*#8020#" />
<engineer_order order="*#3644321#" />
<engineer_order order="*#3644999#" />
<engineer_order order="*#928#" />
<engineer_order order="*#637243#" />
<engineer_order order="*#667611#" />
<engineer_order order="*#667610#" />
<!-- Xiang.Gui Add for 5G test switch *#54794824#-->
<engineer_order order="*#54794824#" />
</engineer_switch>RMX1931L1:/etc $