@PL259 Two notes on what you've described: 1. Regarding daisy chaining REs you can refer to this guide - Q3.6. 2. REs SSID could be the same or different. When using a different SSID for every RE you...

@yanck Yes, D-Link switches notably can cause such an issue especially if you use Deco ethernet backhaul - details. " Note: The Deco Ethernet backhaul feature is based on the standard IEEE 1905.1...

@Vikiiiiii Have you tried to reset the RE200 to its factory default settings by pressing the reset button for about 10 seconds. Upon successful reset you should re-configure the RE from scratch.

@Zombie- Check you RE bottom sticker and make sure what's your FW region and HW version. They have to match the FW upgrade file that you're using - otherwise you'll get that error - details. For...

@PL259 What's you main router make and model ? If you set a static IP addresses on the three extenders you'll alway know them and login their web management.

@Mba2431 Refer to this thread.