Heads Up :
The post you are writing will appear in a public forum. Please ensure all content is appropriate for public consumption. Review the employee guidelines for the community here.
This just worked for us too. We also are running s72033-advipservicesk9_wan-mz.122-33.SXI3.bin and had to do it in the order above for it to work. Just zeroing and adding the key in didn't work. Tried multiple times. Thanks for posting this