I have a WildFly 8.1.0CR1 instance on my free OpenShift Online account. Now I see that a new version of WildFly is available (WildFly 8.1.0Final).
Is it possible to upgrade it without removing the cartridge and adding it again?
You would have to remove the cartridge and re-install it, however, since you can not remove a web_framework cartridge (because it is the main cartridge on the gear) then you would need to create a new gear and migrate your application to it.