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The server can update the Firebase ID token in the following steps:

1. Generate a new ID token by calling the Firebase Admin SDK with the user's refresh token.
2. Send the new ID token to the client via a secure channel.
3. The client should update the old ID token with the new one by calling the Firebase Authentication API.
4. The server should update its records with the new token.

Note: It is recommended to periodically refresh the ID tokens to ensure security and prevent unauthorized access.