ID Code protection related

Hello Renesas Engineering Community,

My company has developed a device using R5F5631A microcontroller for a project. The device FW is implemented with ID code protection feature.

Now a situation has come that we need to upgrade the FW. Unfortunately we lost IDs for some earlier batch of devices. Is there a way out for this problem to be solved so that we can retrieve the MCUs, of which we lost the ID code??  

Thank you

Hashidha K

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