Is there any issue, If I update new certificate on implementation day itself, as SAP sent notification to update it before implementation date.
Please confirm me this. If any failures happens bcz of this?
We recommend you to follow this KBA about the certificate expiration. There you can find all the details about by when you will be notified and all other details.
In Summary, it is recommended to renew the certificates soon after they are available. Note that you can maintain both the "old" certificate and the new one at the same time on your middleware storage. This way you won't face any issues when the change occur. However, please note the "old" certificate should only be removed after the Tentative Deployment date of the certificate as per the KBA table and as per date informed in the e-mail notification you receive.