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It has lost memory for the key and will need to be reprogrammed, which requires the use of a MB STAR scan tool. He can try removing the battery from the smart key for a few minutes and reinserting and trying it, but this rarely works. If it doesnt, then it will require reprogramming of the control module to the keys.
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Hi. There is no "bypass" to get the keys working in the event there is no MB STAR available. But there are other tools that can program the keys. For example a local locksmith has the capability to program these keys. And they can come out to the site where the car is.