@OmarD Maybe something related to the name of the device? When the name will be showed in a config page of the router, the error 9003 appears. Disconnect the device, reboot your router, and try...

Guys, maybe you have a Broadlink RM3 mini device? Look at this: https://community.tp-link.com/en/home/forum/topic/110930

Maybe you have a Broadlink RM3 Mini. Please, look at: https://community.tp-link.com/en/home/forum/topic/110930

Same problem here. Thanks to @PulpImmersion I found the problem and it is also a Broadlink (not Broadcom hehe) RM3 Mini. I have two RM3 devices, and two more Broadlink RMPRO, and a lot of Sonoff and...