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There can be multiple reasons why the startPreview fails on some devices and not on all. Some possible reasons are:

1. Hardware limitations: Different devices may have varying hardware capabilities, and some devices may not have the required hardware to support the camera preview mode.

2. Software compatibility: Different devices may have different software versions installed, and some devices may not be compatible with the camera preview mode due to software conflicts or outdated drivers.

3. Permissions: Some devices may require specific permissions to access the camera preview mode, and if these permissions are not granted, the startPreview function may fail.

4. Malfunctioning hardware or software: In some cases, the camera hardware or software may be malfunctioning, which can cause the startPreview function to fail.

5. Development errors: Sometimes, the startPreview function may fail due to errors in the development process, such as incorrect code syntax or unsupported configurations.