If I have understood your question correctly, I believe you are talking about the AP image predownload option 5/15/25/one shot options.You don't get these options in regular upgrade. However if you are doing - 1. ISSU 2. N+1 hitless upgrade3. Install...

If you are performing upgrade on a flex deployment with remote access points, it is always better to setup a syslog server under the AP Join profile and perform AP image predownload. In the syslog, you should looks for the logs "Image signature verif...