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TPS25762-Q1: burst mode patch download not completing

Part Number: TPS25762-Q1

Tool/software:

I'm using the TPS25762 in a configuration with a microcontroller host (TVSP index 1). The firmware load is timing out in step 8 of www.ti.com/.../slvaff7a.pdf section 4.3.2: "Read and poll the DATAx register until Byte 1 is 0x00, indicating that the device patch bundle download was successful." The register comes back as 0x03:

This continues until the 5-second timeout is reached. Is this 0x03 value an error code of some kind? What does it indicate?