New iPhone Repair Assistant-Compatible Battery – The Ultimate Solution for Unknown Part Message and Battery Health Issues After Battery Replacement on iOS 18.
Installation tips:
1. After installation, the battery health shows 100% with an "Unknown Part" message.
2. To resolve this, go to Settings > General > About > Parts & Service History.
3. Tap Restart & Finish Repair to begin using the Repair Assistant.
4. The status will update to "Used Part"—no flashing or additional steps required.