My guess would be that they shipped with an updated firmware version to the one programmed in the factory. It should have upgraded the first time the device is

My guess would be that they shipped with an updated firmware version to the one programmed in the factory. It should have upgraded the first time the device is powered on but because of a missing security signature or maybe key to verify a signature, the firmware update wasn't applied. This is still just a guess but signed firmware is becoming much more common.