For some bizarre reason one of my KP115 smart plugs will not update to the latest firmware. No matter what I try I cannot get it to update. I've tried the KASA app and the TAPO app without success, I've tried the plug Plugged into a socket close to my wireless router. I've made sure the router is only on 2.4 G. I've tried removing and reinstalling the apps at this point I can only assume one of the plugs is defective. The plug does actually add to my environment and I can turn it on and off remotely. I just can't get the damn thing to update the firmware. Any suggestions?