I accomplished the upgrade on my PR4100 by simply modifying the version number in the install.sh script in the docker folder under Nas_Prog and running the script. I also followed your suggestion and modified the update_portainer.sh script to get the latest Portainer. I didn’t have to open port 9001, though; it works just fine with the original 9000:9000 setting. I didn’t know whether the CPU architecture in the EX series prevents this approach, which is why I pointed the OP to your post.