I am also having a RF problem. I'm a newbie so please take it easy on me. I had my Harmony 890 working fine with my RF and I wanted to add an activity on the remote. After the Harmony software updated (7.3.2, I believe), I attempted to update the remote and RF Extender. When updating the Extender I received a message that I could not communicate with the Extender to update it. I removed the Extender from my account and attempted to update. The update was supposedly successful but the RF does not work at all now. The Remote says that its connected to the RF but still nothing happens. I attempted to follow JCBREMOTES's instructions above but I cant even get my Extender to go into safe mode. I hold the Connect button, RF stays lit, Status blinks and nothing else happens. Any advice would be appreciated in advance. Thanks.