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Yes, OTA updates for your custom ROM will work, but you may need to reflash GApps after each ROM update. Conclusion The TTA Pie Gapp Installer for Android 9 UPD stands as a testament to the ingenuity of the Android modding community. It solves a real problem—keeping old but capable devices running modern(ish) software with full Google functionality. Whether you’re reviving a budget tablet or maintaining a daily driver on Pie, this tool is an essential part of your custom ROM toolkit.

The installer script is typically open, but the APKs are Google’s proprietary binaries. Redistribution is common but not official.

Reflash your ROM (to remove the wrong GApps), then flash the correct ARM64 version.