1, Apply for the AT&T software update via Firmware Over the Air (FOTA) from the Unihertz team. This method is only available for devices with the latest firmware. Before submitting the application, ensure that your system firmware version is up to date.
2, Manually download the latest firmware that includes the AT&T update and follow the instructions to perform a local update and complete the update process. Be careful to choose the correct firmware adapted to your phone's current version.
You can also contact customer support on user manual, our technical department is glad to offer support.