@Mughalmughal If it's about router administrative password you can't recover. You should reset the device to its factory settings and reconfigure from scrtatch.

@azzido Make sure the device is in wireless router mode. On Advanced tab you should have a Security => Access Control option which will allow you to configure whitelist of MAC addresses.

@azzoug RE600X or RE605X are a good candidates too since they are rated AX1800 just as your VX1800v.

@EliWeizman Did you reset the VR600 before you start with the configuration ? Disable VR600 DHCP server and its IPTV. There's nothing more you can do except to update VR600 firmware to the latest one...

@jonl1969 The cheapest solution would be to run an ethernet cable from your AC750 to the inside of your garden room and use another RE (in AP mode) or even a cheap wireless router (in AP mode). This...

@EliWeizman What method did you use to configure VR600 in AP mode ? Here's the oficial method to do that - if you used another configuration, it's recommended to reset the VR600, configure from...