@samindia Maybe this will help you a little, https://community.tp-link.com/en/business/forum/topic/273206

@DanBulmer Ok Controller Version:5.1.7 that realy old version, this controller dont have support for ER8411 so upgrade to latest will fix your problem. supported device is this on your controller

@DanBulmer What version is your controller? I have option to change on my ER8411

@BennyCS I also recomand you to configure ER707 with same LAN ip as your network before adopting router.

@BennyCS This is pretty simpler. first off all take backup of your controller :-) Then remove your old router, go to router and configuration, manage device then forget. then disconnetct the router...

@MatthiasL22 yes I reported this to support for 11 month ago and regulary mention this on forum with @Fae and @Clive_A tagged but not mutch have happend. I also mention this for support in a e-mail...