A clean firmware flash is only half the battle. To truly optimize your 8227L unit:

First boot and post-flash

Before downloading any files, you must verify your unit's actual hardware. Many 8227L units are advertised as Android 10, 11, or 12 , but actually run Android 8.1 (Oreo) with a fake skin Check API Level: Device Info from the Play Store. Android 10 should show API Level 29 Android 8.1 API Level 27 MCU & Build Number: Settings > System > About Device . Take a photo of the MCU version