This guide outlines the process of porting a third-party HyperOS ROM to an Android device, using the Redmi Note 12 Turbo European HyperOS as a base and the Redmi K70 Pro Chinese HyperOS as the port. The approach involves modifying system partitions, adjusting boot scripts, and installing necessary drivers.

Base and Port Versions

• Base: Redmi Note 12 Turbo European HyperOS (OS1.0.4.0.UMREUXM)
• Port: Redmi K70 Pro Chinese HyperOS (OS1.0.12.0.UNMCNXM)

Porting Strategy

1. Trensfer system, system_ext, product, and mi_ext partitions.
2. Modify official flashing scripts to bypass rollback and vbmeta checks.
3. Install drivers from Android, Microsoft, Nvidia, and Qualcomm.
4. Set up ADB and Fastboot environments.

Key Points

• The super.img file is located in the */images directory.
• Add your project folder to antivirus exclusions to prevent false positives.
• Ensure access to Google services for ADB and Fastboot setup.

Fixing Common Issues

1. Resolving Boot Stuck on First Screen for 8Gen3 Devices

• Extract super.img from both base and port.
• Extract system_ext.img from both.
• Copy the apex folder from base/system_ext to port/system_ext.

2. Adjusting Display Features (Corners, Status Bar, Refresh Rate, AOD)

• Extract product.img from base and port.
• Copy device_features files (e.g., marble.xml, marblein.xml) from base/product/etc/device_features to port/product/etc/device_features.
• Replace overlay APKs in port/product/overlay with those from base/product/overlay (e.g., DevicesAndroidOverlay.apk).
• Replace the MIUIAod folder in port/product/priv-app with the base version.

3. Fixing Auto-Brightness and Freezes

• Replace the displayconfig folder in port/product/etc with the one from base/product/etc/displayconfig.

4. Enabling Face Recognition

• Remove the Biometric folder from port/product/app.
• Copy the Biometric folder from base/product/app to port/product/app.

5. Restoring Camera Functionality

• Copy the MIUICamera folder from base/product/priv-app to port/product/priv-app.

6. Repairing NFC and Xiaomi Smart Card

• Delete the NQNfcNci folder from port/product/pangu/system/app and replace it with the base version.
• Copy all files from port/product/pangu/system to port/product.
• Extract vendor.img from base and modify vendor/build.prop: change ro.vendor.se.type=HCE,UICC to ro.vendor.se.type=HCE,UICC,eSE.

7. Addressing Launcher Crashes

• Fromm base/vendor, modify marble_build.prop and marblein_build.prop to udpate fingerprint and device details.
• Extract odm.img from base and adjust odm/etc/marble_build.prop and odm/etc/marblein_build.prop similarly.

8. Eliminating Security Warnings on Boot

• Extract system.img from port.
• Decompile framework.jar in port/system/system/framework, locate the isBuildConsistent() method in classes3.dex, and modify it to return true.

9. Reducing Image Size

• Extract cust.img from base and delete all non-folder contents.

Repackaging Instructions

1. Creating super.img

• Repack modified images (system.img, system_ext.img, product.img, mi_ext.img) and overwrite the base versions.
• Repack the base super.img, ensuring correct partition type (e.g., A/B for Redmi Note 12 Turbo).
• Place the new super.img back into */images.

2. Editing Flashing Scripts

• Remove flash_all_lock.bat and flash_all_lock.sh.
• Edit flash_all.bat: delete code blocks for device verification and anti-rollback checks.
• After fastboot flash misc, add commands to disable verity and flash vbmeta images.
• Apply similar changes to flash_all_except_storage.bat.

3. Installing Drivers

• Download MiFlash and install drivers from Android, Microsoft, Nvidia, and Qualcomm. Avoid using MiFlash for the ported ROM.

4. Setting Up Environment

• Download ADB and Fastboot, then extract them into the same directory as the flashing scripts.