Don’t forget when you change your stick back to a router that you set ALL the parameters to the values need to join smarthings network. This would include the security key, and such. You need to reload the settings you had earlier when the stick would scan your network.
Someplace I put the setting that worked for my Xbee radio. I am not sure they would be the same but I would assume they are.
Read this post here, I’m sure you already saw it since you previously read through that thread.
See if those setting will help you get your stick back onto smarthings radio mesh.