1. Backup all personal data stored on the device to an external location. 2. Download the official Fairphone OS factory image from the manufacturer's support portal. 3. Follow the official Fairphone flashing guide to overwrite the current custom OS (such as /e/OS). 4. Perform a factory reset after the installation to ensure modem firmware compatibility. 5. Once the device reboots, verify that the IMS profile correctly authenticates with A1 Croatia by receiving a test call.
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