It seems you're looking for the for Android 9 (Pie).
You need a custom recovery like TWRP (Team Win Recovery Project) or OrangeFox installed.
Finding a reliable Google Apps (GApps) installer for older Android versions like Android 9.0 (Pie) can be challenging. Many standard custom ROMs come without Google Play Services due to licensing restrictions. The is a specialized utility designed to bridge this gap, allowing users to seamlessly inject Google Play Store, Play Services, and necessary frameworks into Android 9 Pie builds . tta pie gapp installer for android 9 link
The TTA Pie Gapp Installer is a specialized APK tool that simplifies installing Google Mobile Services (GMS) on Android devices lacking official support. It is particularly well-known within the Xiaomi community as an effective solution for installing GApps on MIUI devices. The application, often created by a developer named "Eric Xiang" or "Than Toe Aung," functions as a smart installer that handles the detection, downloading, and setup of all the necessary Google components.
Boot back into your custom recovery. Navigate to Wipe > Advanced Wipe and clear Cache and Dalvik Cache . Restart the phone. Alternatively, go to Settings > Apps > Google Play Services > Storage > Clear All Data. Missing Play Store Icon After Boot It seems you're looking for the for Android 9 (Pie)
Developers frequently host these installers on secure cloud drives like AndroidFileHost (AFH), Mega, or GitHub. Look for links verified by community download counts and positive thread comments.
: Obtain the TTAPieGappInstaller.apk from a reliable source like the TTA Store or mirrored links like MediaFire. Run the App : Open the installer and tap Install Android 9 . Many standard custom ROMs come without Google Play
Tap and manually grant all requested permissions (Location, Storage, Contacts, etc.). 2. Device is Not Play Protect Certified