On December 8, 2025, the FCC released a new version of KDB 986446 D01 v04, with the following main updates:

• TCB is required to conduct substantive due diligence on the U.S. designated agent information specified in the device certification to verify that the agent has a true and valid U.S. physical mailing address, is physically located at that address and can be legally served, and has written consent to act as an agent. If the information cannot be verified, TCB shall not accept the agent. TCBs are required to enter relevant contact information into the non-technical contact column of FCC Form 731 effective December 15, 2025, while still requiring it to be submitted as an attachment.
• The manufacturer must designate a true, legally serviceable U.S. desinated agent to ensure that the address provided is not a virtual or nominal address and obtain the express written consent of the agent; If the agent information is untrue or unverifiable, it will directly affect the acceptance and progress of the equipment authorization application.

Click this link to view the original KDB 986446 D01 v04.